I'm a regular on www.V6Performance.net - it's almost all technical discussion, although if you go to the local forums to your chapter, we are pretty friendly and know each other personally due to meets.

another one is www.accordcompany.com - most of us are just friends or local friends around socal, but it's probably the largest accord-social SoCal board.

ultimately everybody started from www.superhonda.org but it turned bad and everybody left.