I can't really think of a bigger website, alexa.com have it above google/myspace/youtube/msn.
But this thread is about Yahoo Answers, it's fairly new, type a question in any search engine and Yahoo Answers usually have your answer, or if you don't know simply ask it there, a good way to get a ton of traffic.
I ask questions in there quite frequently, it's great, and a lot of fun.
Anyone ever used it?