The fun! project of getting OpenStreetMap maps deployed on Wikimedia servers (e.g. Wikipedia) is grinding forward at a healthy pace, here's the original announcement for those who have no idea what I'm talking about:
http://techblog.wikimedia.org/2009/04/openstreetmap-maps-will-be-added-to-wi...
Unfortunately the project has been somewhat delayed by the Wikimedia.de servers mentioned in that posting taking a bit longer to arrive than expected (the DB server is still not up).
I've personally had some much needed time to work on it recently, right now I'm hacking static map generation as outlined here:
http://www.mediawiki.org/wiki/Extension:SlippyMap/Static_map_generation
(see the RFC at wikitech-l: http://lists.wikimedia.org/pipermail/wikitech-l/2009-July/044027.html)
If you'd like to help here's the bug list I'm working on:
There are lots of tasks to be done. One very interesting task that I'm sure someone would be happy to work on is seeing how this setup scales to >200 languages or so:
https://bugzilla.wikimedia.org/show_bug.cgi?id=19668
Ideally Wikimedia will have static map generation / a tileserver that'll render maps in the locale of the target wiki, so it'll e.g. use name:de tags for de.wikipedia.org.