We’ve been using Quora recently to do a bit of crowd-sourcing and we believe that the concept in and of itself is a good one.  It’s entirely maintained by the participants using the site.

You can ask a question, answer a question, vote on the value of someone else’s answer, follow specific topics, questions or people, plus a lot more.

It seems that social has been married to search in this platform and it seems to be a pretty darn good match.  Maybe not a match made in heaven, but definitely a good one.