Answers next to Knowledge
Apparently, Yahoo's Answers is right after Wikipedia in terms of popularity: "The secret to Yahoo Answers' success: The search giant has stumbled lately, but its popular Q&A service shows that getting people to create their own content can really pay off." I guess I didn't know about it but it makes sense: peer-to-peer networking is taking off, be it online gaming or music/video sharing or money sharing. A MySpace for Q&A's.