This is the only one. I don't have the motivation to put time into other forums, UW takes too much as it is! My little break helped me cut down on the time I spend here now that I'm back again and that's been a good thing. It appears I can be easily addicted to bad habits, such as obsessively checking for new posts on guitar forums.
I've tried to hang out on other forums, but they're either empty as a church on sunday or full of very arrogant or ignorant people. Protip: don't join the @U2 forums unless you're a "die-hard" fan, american and an evangelical christian. Just take my word for it :tard:
The Les Paul and BareKnuckle forums look interesting, but I have nothing to contribute so I'm not registered and pretty much never visit.