<rss>http://en.wikipedia.org/w/index.php?title=Special:Recentchanges&feed=rss</rss>
<rss>http://de.wikipedia.org/wiki/Spezial:Recentchanges&feed=rss</rss>
they are broken,not our fault..hrm...
our own RC feed should work:
<rss>http://s23.org/w/index.php?title=Special:Recentchanges&feed=rss</rss>