I have been a member of the Security Catalyst Forums for a while now. Unfortunately, until a week or so ago, I never participated in the community. For reasons that I'll publicly disclose in a few weeks, I have gotten more active in the community and I wish I had done it earlier.

The forums bring together an interesting group of security professionals who exchange thoughts and opinions freely. Many members also run their own blogs. The community operates a silc server which houses a fairly active group of people (for the server name, sign up for the forums and look around on the boards).
All-in-all, if you have not done it before: go check out the security catalyst forums.