I don't know about forums I usually just lurk Reddit and listen to podcasts from the Corbett Report. Rarely post on any forums anymore except for Bored Aussies. I used to frequent D3Scene and some other hack forums ages ago and Team Liquid most recently. I think STWC was the forum I posted on most, I learned a lot through my dealings with the Sheep Tag community. I wouldn't go back and change a thing.