Springer in cooperation with the European Mathematical Society creates "Encyclopedia of Mathematics" wiki: http://www.encyclopediaofmath.org/index.php/Main_Page Invitation to contribute: http://www.euro-math-soc.eu/node/2671 Notice that it is seeded with 8,000 entries from the Kluwer-published "Encyclopaedia of Mathematics"; these articles remain under copyright to Springer/Kluwer. However, new contributions and edits will be licensed cc-by-sa. Seems like a fun copyright time to me... They are also using MathJax, which I know we are exploring enabling on Wikipedia (and maybe already have?) They also have an editorial board. I didn't delve into it deeply but it's not clear to me what having "full scientific authority over alterations and deletions" means; though it looks like they are discussing various models of review. As the librarian who sent this around said.... why wouldn't mathematicians who were so inclined just contribute to Wikipedia articles instead? There is some debate about that point on the EoM talk page. http://www.encyclopediaofmath.org/index.php/Talk:EoM:This_project#EoM_and_WP This does raise an interesting sourcing issue though -- the published Encyc. of Math is certainly a reputable source, and should be cited in the appropriate Wikipedia articles, though I know there's a lot of debate around whether to cite other wikis as sources. And on the Encyclopedia of Math wiki talk page there's a debate about whether they should copy material from Wikipedia! -- phoebe