Just a head's up about 3 new extensions I've come out with in the last few weeks. They are all documented on my homepage and on mw.org
Special:Update
A Special:Version-like page that displays if the core or extensions have new versions out. It currently uses official mediawiki bundles (currently at 1.17.0) and extension pages on mw.org to get version information. I'll be iterating releases on this extension a lot to keep shipping "working" features, next up will be SVN, then GIT. I'm aiming to support more than MW repos with it.
http://olivierbeaton.com/mediawiki#update
Realnames
Many of us use the real name fields, especially when running LDAP auth modules, and especially in corporate environments. If you're just looking to append the realname to the display of usernames or replace it altogether with realnames (from user prefs) then this extension is for you. One day this will might be in core, until then this will work on every single page in your wiki. If you find a place it's not converting, let me know!
http://olivierbeaton.com/mediawiki#realnames
HeadersFooters
This extension lets you add a header or footer to pages on a global, namespace, category or page basis. The most useful part is for example adding something to all User_talk: pages, or adding a <references/> perhaps at the end of all pages in a specific category. I plan to release a Special: page in the next version to make header/footer creation urls more obvious, but until then it should be fully functional.
http://olivierbeaton.com/mediawiki#headersfooters
Thanks for your time, and feel free to come chat with me in irc "Finlay". Olivier Finlay Beaton
mediawiki-l@lists.wikimedia.org