Being put together by Eliezer Yudkowsky of LessWrong. Content is cc-by-sa 3.0, don't know about the software.
https://arbital.com/p/arbital_ambitions/
Rather than the "encyclopedia" approach, it tries to be more pedagogical, teaching the reader at their level.
Analysis from a sometime Yudkowsky critic on Tumblr: http://nostalgebraist.tumblr.com/post/140995096534/a-year-ago-i-remember-bei...
(there's a pile more comments linked from the notes on that post, mostly from quasi-fans; I have an acerbic comment in there, but you should look at the site yourself first.)
No idea if this will go anywhere, but might be of interest; new approaches generally are. They started in December, first publicised it a week ago and have been scaling up. First day it collapsed due to load from a Facebook post announcement ... so maybe hold off before announcing it everywhere :-)
- d.