diff --git a/include/application.php b/include/application.php
index 64f3cc6..4b13adf 100644
--- a/include/application.php
+++ b/include/application.php
@@ -949,10 +949,20 @@ class Application {
 
         $sExtraTables = '';
         $sWhereFilter = $oFilters ? $oFilters->getWhereClause() : '';
-        if($sWhereFilter)
+        $aOptions = $oFilters ? $oFilters->getOptions() : array('onlyDownloadable' => 'false');
+
+        if($sWhereFilter || $aOptions['onlyDownloadable'] == 'true')
         {
             $sExtraTables = ',appVersion';
-            $sWhereFilter = " AND appVersion.appId = appFamily.appId AND $sWhereFilter";
+            if($sWhereFilter)
+                $sWhereFilter = " AND $sWhereFilter";
+            $sWhereFilter = " AND appVersion.state = 'accepted' AND appVersion.appId = appFamily.appId $sWhereFilter";
+        }
+
+        if($aOptions['onlyDownloadable'] == 'true')
+        {
+            $sExtraTables .= ',appData';
+            $sWhereFilter .= " AND appData.type = 'downloadurl' AND appData.versionId = appVersion.versionId AND appData.state = 'accepted'";
         }
         /* Should we add a limit clause to the query? */
         if($iRows || $iStart)
@@ -1025,6 +1035,7 @@ class Application {
         $oFilter->AddFilterInfo('appVersion.rating', 'Rating', array(FILTER_EQUALS, FILTER_LESS_THAN, FILTER_GREATER_THAN), FILTER_VALUES_ENUM, array('Platinum', 'Gold', 'Silver', 'Bronze', 'Garbage'));
         $oFilter->AddFilterInfo('appFamily.catId', 'Category', array(FILTER_EQUALS), FILTER_VALUES_ENUM, $aCatIds, $aCatNames);
         $oFilter->AddFilterInfo('appVersion.license', 'License', array(FILTER_EQUALS), FILTER_VALUES_ENUM, $aLicenses);
+        $oFilter->AddFilterInfo('onlyDownloadable', 'Only show downloadable apps', array(FILTER_OPTION_BOOL), FILTER_VALUES_OPTION_BOOL, array('false','true'));
         return $oFilter;
     }
 
@@ -1167,10 +1178,20 @@ class Application {
     {
         $sExtraTables = '';
         $sWhereFilter = $oFilters ? $oFilters->getWhereClause() : '';
-        if($sWhereFilter)
+        $aOptions = $oFilters ? $oFilters->getOptions() : array('onlyDownloadable' => 'false');
+
+        if($sWhereFilter || $aOptions['onlyDownloadable'] == 'true')
         {
             $sExtraTables = ',appVersion';
-            $sWhereFilter = " AND appVersion.appId = appFamily.appId AND $sWhereFilter";
+            if($sWhereFilter)
+                $sWhereFilter = " AND $sWhereFilter";
+            $sWhereFilter = " AND appVersion.appId = appFamily.appId $sWhereFilter";
+        }
+
+        if($aOptions['onlyDownloadable'] == 'true')
+        {
+            $sExtraTables .= ',appData';
+            $sWhereFilter .= " AND appData.type = 'downloadurl' AND appData.versionId = appVersion.versionId";
         }
 
         if($sState != 'accepted' && !application::canEdit())
diff --git a/include/db_filter.php b/include/db_filter.php
index e5a556d..09fa909 100644
--- a/include/db_filter.php
+++ b/include/db_filter.php
@@ -14,7 +14,7 @@ define('FILTER_GREATER_THAN', 3);
 define('FILTER_LESS_THAN', 4);
 define('FILTER_NOT_EQUALS', 5);
 define('FILTER_NOT_LIKE', 6);
-define('FILTER_ENUM', 7);
+define('FILTER_OPTION_BOOL', 7);
 
 /* A filter as part of an SQL query, such as something = 'somevalue' */
 class Filter
@@ -72,8 +72,13 @@ class Filter
         }
     }
 
-    public function getFilter()
+    /* Gets an SQL expression representing the current filter, for use in a WHERE clause */
+    public function getExpression()
     {
+        /* We let callers handle options themselves, so don't include them in the WHERE clause */
+        if($this->iType == FILTER_OPTION_BOOL)
+            return '';
+
         $sOp = $this->getOperator();
 
         return "{$this->sColumn} $sOp '{$this->sData}'";
@@ -150,18 +155,18 @@ class FilterSet
 
     public function getWhereClause()
     {
-        $sFilter = '';
+        $aFilters = array();
         for($i = 0; $i < sizeof($this->aFilters); $i++)
         {
             $oFilter = $this->aFilters[$i];
 
-            $sFilter .= $oFilter->getFilter();
+            $sThisFilter = $oFilter->getExpression();
 
-            if($i < sizeof($this->aFilters) - 1)
-                $sFilter .= ' AND ';
+            if($sThisFilter)
+                $aFilters[] = $sThisFilter;
         }
 
-        return $sFilter;
+        return implode($aFilters, ' AND ');
     }
 
     function getQuery($sTable, $iLimit = 0)
diff --git a/include/db_filter_ui.php b/include/db_filter_ui.php
index ed2f270..a301d5b 100644
--- a/include/db_filter_ui.php
+++ b/include/db_filter_ui.php
@@ -13,6 +13,7 @@ require_once('db_filter.php');
 define(FILTER_VALUES_NORMAL, 1);
 define(FILTER_VALUES_ENUM, 2);
 define(FILTER_VALUES_BOOL, 3);
+define(FILTER_VALUES_OPTION, 4);
 
 /* Info describing an available filter: what column it applies to,
     and what comparison options are available */
@@ -158,6 +159,37 @@ class FilterInterface
         return $shEditor;
     }
 
+    public function getOptionBoolEditor($iId, Filter $oFilter)
+    {
+        $sColumn = $this->escapeChars($oFilter->getColumn());
+        $oColumn = $this->aFilterInfo[$oFilter->getColumn()];
+        $sId = ($iId == -1) ? '' : $iId;
+
+        $aTypes = $oColumn->getTypes();
+        $iOp = $aTypes[0];
+
+        if($iId == -1)
+        {
+            /* The first entry in the list of choices is the default */
+            $aValues = $oColumn->getValueTypeData();
+            $sData = $aValues[0];
+        } else
+        {
+            $sData = $oFilter->getData();
+        }
+
+        $shRet = "<input type=\"hidden\" name=\"i{$sColumn}Op$sId\" value=\"$iOp\" />";
+
+        if($sData == 'true')
+            $sChecked = ' checked="checked"';
+        else
+            $sChecked = '';
+
+        $shRet .= "<input value=\"true\" $sChecked name=\"s{$sColumn}Data$sId\" type=\"checkbox\" />";
+        $shRet .= ' '.$oColumn->getDisplayName();
+
+        return $shRet;
+    }
 
     public function getItemEditor($iId, Filter $oFilter)
     {
@@ -295,21 +327,12 @@ class FilterInterface
 
     public function getEditor()
     {
-        $shEditor = '';
+        $shNewItemsEditor = '';
+        $shCurrentItemsEditor = '';
         $aCounts = array();
 
-        $shEditor .= '<b>Add new filter</b> <i>(You don&#8217;t have to fill out all rows.)</i><br />';
-        foreach($this->aFilterInfo as $oOption)
-        {
-            $oDummyFilter = new Filter($oOption->getColumn(), 0, '');
-            $aTypes = $oOption->getTypes();
-
-              $shEditor .= $this->getItemEditor(-1, $oDummyFilter);
-            $shEditor .= '<br />';
-        }
-
         if(sizeof($this->oFilterSet->getFilters()))
-             $shEditor .= '<br /><b>Active filters</b><br />';
+             $shCurrentItemsEditor .= '<br /><b>Active filters</b><br />';
         foreach($this->oFilterSet->getFilters() as $oFilter)
         {
             $sColumn = $oFilter->getColumn();
@@ -317,13 +340,33 @@ class FilterInterface
             if(!array_key_exists($sColumn, $aCounts))
                 $aCounts[$sColumn] = 0;
 
-            $shEditor .= $this->getItemEditor($aCounts[$sColumn], $oFilter);
-            $shEditor .= '<br />';
+            if($oFilter->getOperatorId() == FILTER_OPTION_BOOL)
+                $shCurrentItemsEditor .= $this->getOptionBoolEditor($aCounts[$sColumn], $oFilter);
+            else
+                $shCurrentItemsEditor .= $this->getItemEditor($aCounts[$sColumn], $oFilter);
+            $shCurrentItemsEditor .= '<br />';
 
             $aCounts[$sColumn]++;
         }
 
-        return $shEditor;
+        $shNewItemsEditor .= '<b>Add new filter</b> <i>(You don&#8217;t have to fill out all rows.)</i><br />';
+        foreach($this->aFilterInfo as $oOption)
+        {
+            $oDummyFilter = new Filter($oOption->getColumn(), 0, '');
+            $aTypes = $oOption->getTypes();
+
+            if($oOption->getValueType() == FILTER_VALUES_OPTION_BOOL)
+            {
+                if(!array_key_exists($oOption->getColumn(), $aCounts))
+                    $shNewItemsEditor .= $this->getOptionBoolEditor(-1, $oDummyFilter);
+            } else
+            {
+                $shNewItemsEditor .= $this->getItemEditor(-1, $oDummyFilter);
+            }
+            $shNewItemsEditor .= '<br />';
+        }
+
+        return $shNewItemsEditor.$shCurrentItemsEditor;
     }
 
     public function getFilterInfo()
@@ -335,11 +378,12 @@ class FilterInterface
     public function readInputForColumn($aClean, FilterInfo $oOption)
     {
         $aReturn = array();
+        $bChangedOption = false;
 
         for($i = 0; array_key_exists('i'.$this->escapeChars($oOption->getColumn())."Op$i", $aClean); $i++)
         {
             $sColumn = $this->escapeChars($oOption->getColumn());
-            $sData = query_escape_string($aClean["s{$sColumn}Data$i"]);
+            $sData = query_escape_string(getInput("s{$sColumn}Data$i", $aClean));
             $iOp = $aClean["i{$sColumn}Op$i"];
 
             if(!$iOp)
@@ -347,6 +391,20 @@ class FilterInterface
 
             $oFilter = new Filter($oOption->getColumn(), $iOp, $sData);
 
+            /* Only show an option as an active filter if it has been changed
+               from the default */
+            if($oOption->getValueType() == FILTER_VALUES_OPTION_BOOL)
+            {
+                /* The default option is the first entry in the list of choices */
+                $aChoices = $oOption->getValueTypeData();
+                $sDefault = $aChoices[0];
+                if(!$sData)
+                    $sData = 'false';
+                if($sData == $sDefault)
+                    continue;
+                $bChangedOption = true;
+            }
+
             $aReturn[] = $oFilter;
         }
 
@@ -357,7 +415,8 @@ class FilterInterface
             $sData = $aClean["s{$sColumn}Data"];
             $iOp = $aClean["i{$sColumn}Op"];
 
-            if($iOp && $sData)
+
+            if($iOp && $sData && ($oOption->getValueType() != FILTER_VALUES_OPTON_BOOL || !$bChangedOoption))
             {
                 $oFilter = new Filter($oOption->getColumn(), $iOp, $sData);
                 $aReturn[] = $oFilter;
@@ -393,6 +452,29 @@ class FilterInterface
         return $this->oFilterSet->getFilterCount();
     }
 
+     /* Returns an array of options, where the keys are the columns and the members
+        are the settings themselves */
+    public function getOptions()
+    {
+        $aOptions = array();
+        foreach($this->oFilterSet->getFilters() as $oFilter)
+        {
+            if($oFilter->getOperatorId() == FILTER_OPTION_BOOL)
+                $aOptions[$oFilter->getColumn()] = $oFilter->getData();
+        }
+        foreach($this->aFilterInfo as $oFilterInfo)
+        {
+            if($oFilterInfo->getValueType() == FILTER_VALUES_OPTION_BOOL &&
+               !array_key_exists($oFilterInfo->getColumn(), $aOptions))
+            {
+                $aTypes = $oFilterInfo->getTypes();
+                $sDefault = $aTypes[0];
+                $aOptions[$oFilterInfo->getColumn()] = $sDefault;
+            }
+        }
+        return $aOptions;
+    }
+
     public function getWhereClause()
     {
         return $this->oFilterSet->getWhereClause();
diff --git a/include/objectManager.php b/include/objectManager.php
index f565185..0ae6113 100644
--- a/include/objectManager.php
+++ b/include/objectManager.php
@@ -1220,7 +1220,7 @@ class ObjectManager
     }
 
     /* Make an objectManager URL based on the object and optional parameters */
-    public function makeUrl($sAction = false, $iId = false, $sTitle = false)
+    public function makeUrl($sAction = false, $iId = false, $sTitle = false, $bOmitFilters = false)
     {
         $sUrl = APPDB_ROOT."objectManager.php?";
 
@@ -1253,7 +1253,10 @@ class ObjectManager
             $sUrl .= "&amp;iPage=".$this->oMultiPage->iPage;
         }
 
-        if($this->oFilters)
+        /* Some times it is necessary to omit the filter data, for instance when using
+           makeUrl() to form the action element of a form tag.  This is because having
+           filter data present may prevent clearing a filter */
+        if($this->oFilters && !$bOmitFilters)
             $sUrl .= $this->oFilters->getUrlData();
 
         if($this->oSortInfo && $this->oSortInfo->sCurrentSort)
@@ -1338,9 +1341,9 @@ class ObjectManager
         /* Show filter info */
         if($this->oFilters)
         {
-            echo "<form method=\"post\" action=\"".$this->makeUrl()."\" >";
+            echo "<form method=\"post\" action=\"".$this->makeUrl(false, false, false, true)."\" >";
 
-             echo $this->oFilters->getEditor();
+            echo $this->oFilters->getEditor();
 
             echo "<br><input type='submit' value='Submit' name='sSubmit' >";
             echo "</form>";