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Aside from us, askville, answerbag, live qna, metafilter, blurtit, help.com, and dozens more. Of course I'm biased, but if you see something you really like elsewhere, suggest it to us and we can try to implement similar functionality.
No other question & answer site lists 'make the world a better place' as part of it's mission statement, and maybe we won't, however, we are trying. 
If we can't help you, in my opinion, none of those sites can...but you can always see for your self.
I'm not sure of any other answer and ask question sites.
I know that yahoo has a section for asking and answering. I wouldn't recomend yahoo answers since some of the people are not as friendly. Pluss, you need points to answer questions. It isn't easy to brows. This one and yahoo are the only two I know of.
You can get other sites from other people.




Websites for asking questions and answers ?
Websites for asking questions and answers ? brsides this one