Despite being reasonably active on StackOverflow, I wonder if it will eventually go the way of most forums when the noise level becomes too high? One thing’s for certain, its search ability is as bad as another high-profile programming site I probably shouldn’t mention (and I don’t mean the Symbol developer site, which is certainly a candidate…).
Once in a while, there are questions and answers on SO that really stand out, such as this answer to the question “Why is UI design so hard for some Developers?”.