In my experience, Stack Overflow is still one of the only places that I can ask questions and expect to receive useful information within the same day. I admit I don't answer questions as much as I used to, but there still seems to be plenty of people around to help. Also, as a general corpus of knowledge it really can't be beat - I often find useful answers to questions that were asked years ago.

I know it's currently in vogue to hate on it, but for me it continues to be a great source of information.