What are the best Q-and-A sites out there besides Yahoo! Answers...?

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Well whichever site you go, crazy people will be there. I am too sometimes fed up on all the answering sites I have tried, but unfortunately in a community, there will be good people, and there will be bad people.

Anyways, if you can ask concrete questions, you can try http://www.stackexchange.com/ . They have a huge community and usually you can get fast answers there. Make sure you ask the questions in the right category. But unfortunately you cannot ask questions so lightly like you can ask on Yahoo answers. You need to be point accurate in asking questions in stackexchange sites.

quora.com is a new one and looks good. But one thing about it annoys me is to read several answers, they require you to log in. I feel like that restrains knowledge a bit. I often find answer links to quora by searching a question in Google, and just to read the answer, they want me to log in. That's just ridiculous, and that's why I avoid quora. But if you are ok with that, you can try that.