There are currently 353 open bugs filed on the MediaWiki component which are not enhancement requests.
Yikes! Went the wrong direction in the last couple days. :)
http://bugzilla.wikimedia.org/shortcut/openbugs
17 of those bugs have patches, which need to be reviewed and either applied or replaced with something better: http://bugzilla.wikimedia.org/shortcut/patches
-- brion vibber (brion @ pobox.com)