I'm in a bunch of them now, although I don't visit some of them as often as others. I'm mostly found over on david-cook.org these days, although I also belong to about 4 others too.
Hoping other people will find their way to this one and start posting!
It's nice on some of the bigger forums but your posts can get lost if no one posts back within 5 minutes or so, there's so much going on, your post just drops back into page a million somewhere, lol.