I went to the Wetpaint site and really enjoyed the video about the scooter Wiki. I recently just set up a web page for my family and I'm wondering if a Wiki would have been better. That way I could invite my extended family and it could include pictures and comments form them.
Personally it sometimes becomes overwhelming. To have more "things" you have to check and keep up with. I talked to my staff about doing a blog for our region. Most of them are just getting used to the portal that we have and I think more for them would be overwhelming and they wouldn't use it. Sometime too much technology is a bad thing.