I apologize for the delay - we are in the midst of launching a bunch of other projects around here.
I have created the mediawiki-agora sf project: http://sourceforge.net/projects/mediawiki-agora/
Please email me your sf id if you have any interest in developing here.
The idea behind this collective is to let anyone developer who is interested become a contributor so we can begin collecting extensions, scripts, and useful tools in one place. I hope to convince some of the existing extensions authors to host stuff here (at least until it gets integrated into the core).
If anyone is interested, here is an announcemnt indicating Columbia University's CNMTL commitment to the mediawiki
http://ccnmtl.columbia.edu/web/p03_announcements.html#20050131
Thanks to Peter Danenberg for the nifty name.
best regards, Jonah