Some time ago,
Joel Spolsky and
Jeff Atwood created
StackOverflow.com, a developer-oriented Question and Answer Website. Yes, Q&A, not QA. I've been a member there for some time, and have had some fun contributing ideas.
They generalized the software, making it possible to make any Q&A site focused on whatever you desire very easily. My colleague and friend
Justin Hunter took the initiative to create
testing.stackexchange.com
Of course, the problem with these things is they have a bit of a chicken and egg problem. There's not a lot to check out, so you don't participate much, so when other people find, they don't find a lot to check out, so they don't participate much ...
A few months later, it seems like the site is reaching a critical mass; I just threw up my
first answer to a question, which I see Michael Bolton already answered as well.
If you haven't looked into
testing.stackexchange.com yet, then please, let me recommend it to you. If you have, but there wasn't much there, it might be time to check again.