My 3 favorite crowdsourcing sites:

http://www.cambrianhouse.com/

http://www.crowdspring.com/

http://www.innocentive.com/

A fun and semi-related site: http://www.ask500people.com/. I enjoy flinging random questions out there and seeing how people respond.  Try one now!

Update:  How cool is this—I posted my 3 favorite crowdsourcing sites at 10:00 am. By 10:10, the co-founder of www.crowdspring.com adds his comment to this post.  That’s the world we live in…everyday is a New York minute!