Only in .: cache-namespace.patch
diff -ur ./ChangesFeed.php /var/www/mediawiki/includes/ChangesFeed.php
--- ./ChangesFeed.php	2009-02-14 16:00:51.000000000 +0000
+++ /var/www/mediawiki/includes/ChangesFeed.php	2009-12-15 14:51:07.000000000 +0000
@@ -18,7 +18,7 @@
 			$feedTitle, htmlspecialchars( $description ), $wgTitle->getFullUrl() );
 	}
 
-	public function execute( $feed, $rows, $limit=0, $hideminor=false, $lastmod=false, $target='' ) {
+	public function execute( $feed, $rows, $limit=0, $hideminor=false, $namespace='', $lastmod=false, $target='' ) {
 		global $messageMemc, $wgFeedCacheTimeout;
 		global $wgSitename, $wgContLanguageCode;
 
@@ -27,7 +27,7 @@
 		}
 
 		$timekey = wfMemcKey( $this->type, $this->format, 'timestamp' );
-		$key = wfMemcKey( $this->type, $this->format, $limit, $hideminor, $target );
+		$key = wfMemcKey( $this->type, $this->format, $limit, $hideminor, $namespace, $target );
 
 		FeedUtils::checkPurge($timekey, $key);
 
diff -ur ./specials/SpecialRecentchanges.php /var/www/mediawiki/includes/specials/SpecialRecentchanges.php
--- ./specials/SpecialRecentchanges.php	2009-05-01 07:59:04.000000000 +0100
+++ /var/www/mediawiki/includes/specials/SpecialRecentchanges.php	2009-12-15 14:54:58.000000000 +0000
@@ -67,8 +67,8 @@
 	public function feedSetup() {
 		global $wgFeedLimit, $wgRequest;
 		$opts = $this->getDefaultOptions();
-		# Feed is cached on limit,hideminor; other params would randomly not work
-		$opts->fetchValuesFromRequest( $wgRequest, array( 'limit', 'hideminor' ) );
+		# Feed is cached on limit,hideminor,namespace; other params would randomly not work
+		$opts->fetchValuesFromRequest( $wgRequest, array( 'limit', 'hideminor', 'namespace' ) );
 		$opts->validateIntBounds( 'limit', 0, $wgFeedLimit );
 		return $opts;
 	}
@@ -117,7 +117,7 @@
 		$target = isset($opts['target']) ? $opts['target'] : ''; // RCL has targets
 		if( $feedFormat ) {
 			list( $feed, $feedObj ) = $this->getFeedObject( $feedFormat );
-			$feed->execute( $feedObj, $rows, $opts['limit'], $opts['hideminor'], $lastmod, $target );
+			$feed->execute( $feedObj, $rows, $opts['limit'], $opts['hideminor'], $opts['namespace'], $lastmod, $target );
 		} else {
 			$this->webOutput( $rows, $opts );
 		}