Before INGO I used to spend most of my time on GlockTalk. Don't go there much at all anymore. I'll check out AR15 once in a while. Most of my gun time online is spent here.
I was kicked off the S&W forum for disparaging casinos, and especially one long time member who was a casino employee. I compared casinos to whorehouses. Still do. I took revenge by blasting the owner of S&W on the Sig forum, [same fellow] and was promptly booted from there.
They had every right to ban me, but I couldn't resist getting my licks in..........
Used to like TheHighRoad.org, but got turned off by the ownership battle.
TheFiringLine.com is good for information related posts but not so much local flavor or socializing.
Not a gun board, but a blog: View From The Porch
Broadripple's own Tam, Queen of Tactical Snark.
Also, linked from that site, is another very good blog called Xavier Thoughts.