diff --git a/wp-admin/edit-form-advanced.php b/wp-admin/edit-form-advanced.php
index c71aa710cf..7bafd08e61 100644
--- a/wp-admin/edit-form-advanced.php
+++ b/wp-admin/edit-form-advanced.php
@@ -1,4 +1,4 @@
-<?php
+ <?php
 $action = isset($action)? $action : '';
 if ( isset($_GET['message']) )
 	$_GET['message'] = absint( $_GET['message'] );
@@ -222,7 +222,7 @@ endif; ?>
 	<p id="category-add" class="wp-hidden-child">
 		<input type="text" name="newcat" id="newcat" class="form-required form-input-tip" value="<?php _e( 'New category name' ); ?>" tabindex="3" />
 		<?php wp_dropdown_categories( array( 'hide_empty' => 0, 'name' => 'newcat_parent', 'orderby' => 'name', 'hierarchical' => 1, 'show_option_none' => __('Parent category'), 'tab_index' => 3 ) ); ?>
-		<input type="button" id="category-add-sumbit" class="add:categorychecklist:categorydiv button" value="<?php _e( 'Add' ); ?>" tabindex="3" />
+		<input type="button" id="category-add-sumbit" class="add:categorychecklist:category-add button" value="<?php _e( 'Add' ); ?>" tabindex="3" />
 		<?php wp_nonce_field( 'add-category', '_ajax_nonce', false ); ?>
 		<span id="category-ajax-response"></span>
 	</p>
@@ -233,15 +233,15 @@ endif; ?>
 	<li class="wp-no-js-hidden"><a href="#categories-pop" tabindex="3"><?php _e( 'Most Used' ); ?></a></li>
 </ul>
 
-<div id="categories-all" class="ui-tabs-panel">
-	<ul id="categorychecklist" class="list:category categorychecklist form-no-clear">
-		<?php dropdown_categories(); ?>
+<div id="categories-pop" class="ui-tabs-panel" style="display: none;">
+	<ul id="categorychecklist-pop" class="categorychecklist form-no-clear" >
+		<?php $popular_ids = wp_popular_terms_checklist('category'); ?>
 	</ul>
 </div>
 
-<div id="categories-pop" class="ui-tabs-panel" style="display: none;">
-	<ul id="categorychecklist-pop" class="categorychecklist form-no-clear" >
-		<?php wp_popular_terms_checklist('category'); ?>
+<div id="categories-all" class="ui-tabs-panel">
+	<ul id="categorychecklist" class="list:category categorychecklist form-no-clear">
+		<?php dropdown_categories( 0, 0, $popular_ids ); ?>
 	</ul>
 </div>
 
diff --git a/wp-admin/includes/template.php b/wp-admin/includes/template.php
index 1bc776339e..c34d4fea37 100644
--- a/wp-admin/includes/template.php
+++ b/wp-admin/includes/template.php
@@ -175,9 +175,10 @@ function get_nested_categories( $default = 0, $parent = 0 ) {
 	return $result;
 }
 
-function write_nested_categories( $categories ) {
+function write_nested_categories( $categories, $popular_ids = array() ) {
 	foreach ( $categories as $category ) {
-		echo "\n", '<li id="category-', $category['cat_ID'], '"><label for="in-category-', $category['cat_ID'], '" class="selectit"><input value="', $category['cat_ID'], '" type="checkbox" name="post_category[]" id="in-category-', $category['cat_ID'], '"', ($category['checked'] ? ' checked="checked"' : "" ), '/> ', wp_specialchars( apply_filters('the_category', $category['cat_name'] )), '</label>';
+		$class = in_array( $category['cat_ID'], $popular_ids ) ? ' class="popular-category"' : '';
+		echo "\n", "<li id='category-$category[cat_ID]'$class>", '<label for="in-category-', $category['cat_ID'], '" class="selectit"><input value="', $category['cat_ID'], '" type="checkbox" name="post_category[]" id="in-category-', $category['cat_ID'], '"', ($category['checked'] ? ' checked="checked"' : "" ), '/> ', wp_specialchars( apply_filters('the_category', $category['cat_name'] )), '</label>';
 
 		if ( $category['children'] ) {
 			echo "\n<ul>";
@@ -188,18 +189,20 @@ function write_nested_categories( $categories ) {
 	}
 }
 
-function dropdown_categories( $default = 0, $parent = 0 ) {
-	write_nested_categories( get_nested_categories( $default, $parent ) );
+function dropdown_categories( $default = 0, $parent = 0, $popular_ids = array() ) {
+	write_nested_categories( get_nested_categories( $default, $parent ), $popular_ids );
 }
 
 function wp_popular_terms_checklist( $taxonomy, $default = 0, $number = 10 ) {
 	$categories = get_terms( $taxonomy, array( 'orderby' => 'count', 'order' => 'DESC', 'number' => $number ) );
 
+	$popular_ids = array();
 	foreach ( (array) $categories as $category ) {
+		$popular_ids[] = $category->term_id;
 		$id = "popular-category-$category->term_id";
 		?>
 
-		<li id="<?php echo $id; ?>" >
+		<li id="<?php echo $id; ?>" class="popular-category">
 			<label class="selectit" for="in-<?php echo $id; ?>">
 			<input id="in-<?php echo $id; ?>" type="checkbox" value="<?php echo (int) $category->term_id; ?>" />
 				<?php echo wp_specialchars( apply_filters( 'the_category', $category->name ) ); ?>
@@ -208,6 +211,7 @@ function wp_popular_terms_checklist( $taxonomy, $default = 0, $number = 10 ) {
 
 		<?php
 	}
+	return $popular_ids;
 }
 
 function dropdown_link_categories( $default = 0 ) {
diff --git a/wp-admin/js/post.js b/wp-admin/js/post.js
index 78b22ed911..18c9706fac 100644
--- a/wp-admin/js/post.js
+++ b/wp-admin/js/post.js
@@ -118,6 +118,10 @@ jQuery(document).ready( function() {
 		jQuery('#in-category-' + id + ', #in-popular-category-' + id).attr( 'checked', c );
 		noSyncChecks = false;
 	};
+	var catAddBefore = function( s ) {
+		s.data += '&' + jQuery( '#categorychecklist :checked' ).serialize();
+		return s;
+	};
 	var catAddAfter = function( r, s ) {
 		if ( !newCatParent ) newCatParent = jQuery('#newcat_parent');
 		if ( !newCatParentOption ) newCatParentOption = newCatParent.find( 'option[value=-1]' );
@@ -140,6 +144,7 @@ jQuery(document).ready( function() {
 	jQuery('#categorychecklist').wpList( {
 		alt: '',
 		response: 'category-ajax-response',
+		addBefore: catAddBefore,
 		addAfter: catAddAfter
 	} );
 	jQuery('#category-add-toggle').click( function() {
@@ -148,7 +153,7 @@ jQuery(document).ready( function() {
 		jQuery('#newcat').focus();
 		return false;
 	} );
-	jQuery('.categorychecklist :checkbox').change( syncChecks ).filter( ':checked' ).change();
+	jQuery('.categorychecklist .popular-category :checkbox').change( syncChecks ).filter( ':checked' ).change();
 
 	jQuery('.edit-timestamp').click(function () {
 		if (jQuery('#timestampdiv').is(":hidden")) {
diff --git a/wp-includes/js/wp-lists.js b/wp-includes/js/wp-lists.js
index e1ef515712..884f02a6fd 100644
--- a/wp-includes/js/wp-lists.js
+++ b/wp-includes/js/wp-lists.js
@@ -313,11 +313,11 @@ var wpList = {
 				var addEl = this;
 				var c = wpList.parseClass(this,'add')[2] || addEl.id;
 				if ( !c ) { return; }
-				var forms = []; var ins = [];
+				var forms = []; var ins = []; // this is all really inefficient
 				$('#' + c + ' :input').focus( function() { currentFormEl = this; } ).blur( function() { currentFormEl = false; } ).each( function() {
 					ins.push(this);
-					$.merge(forms,$(this).parents('form'));
-					forms = $.unique(forms);
+					var f = $(this).parents('form:first').get(0);
+					if ( $.inArray(f,forms) < 0 ) { forms.push(f); }
 				} );
 				$(forms).submit( function() {
 					if ( 0 <= $.inArray(currentFormEl,ins) ) {
diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index 1c834ae31d..b1ea502946 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -57,7 +57,7 @@ class WP_Scripts {
 			'whoaText' => __("Slow down, I'm still sending your data!")
 		) );
 
-		$this->add( 'wp-lists', '/wp-includes/js/wp-lists.js', array('wp-ajax-response'), '20080322' );
+		$this->add( 'wp-lists', '/wp-includes/js/wp-lists.js', array('wp-ajax-response'), '20080411' );
 		$this->localize( 'wp-lists', 'wpListL10n', array(
 			'url' => get_option( 'siteurl' ) . '/wp-admin/admin-ajax.php'
 		) );
@@ -144,7 +144,7 @@ class WP_Scripts {
 				'save' => __('Save'),
 				'cancel' => __('Cancel'),
 			) );
-			$this->add( 'post', '/wp-admin/js/post.js', array('suggest', 'jquery-ui-tabs', 'wp-lists', 'postbox', 'slug'), '20080322' );
+			$this->add( 'post', '/wp-admin/js/post.js', array('suggest', 'jquery-ui-tabs', 'wp-lists', 'postbox', 'slug'), '20080411' );
 			$this->localize( 'post', 'postL10n', array(
 				'tagsUsed' =>  __('Tags used on this post:'),
 				'add' => attribute_escape(__('Add')),