Wikipedia needs Us?
I recently read or heard that a bigwig at wikipedia declared a deficit in editors/content providers at the wikipedia site. This is your chance people! You can step in and fill the gaps!!!!
Here are a couple of other cool sites of similar vein:
http://www.theslot.com/copyeditors.html -for copy editing stuff.
http://www.word-detective.com/ -for etymology stuff (not to be confused with entomology the study of insects, I try to remember ent like ants for the insect things!).
http://www.pgdp.net/c/ for Distributed ProofReaders a project gutenburg related group.
and of course http://www.bbc.co.uk/h2g2/ the Douglas Adams inspired wikipedia like site.