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There are a couple of help desk tools which can compile a Q&A style knowledge base out of customer support emails. Here's one I'm familiar with: http://www.desk.com/product#sec6

What about AskBot ?

http://askbot.com/

It has problems in the design department. It appears extremely busy, because your eye is drawn to the top and right hand side of the page, which is completely devoid of any content.

It's not helped by all the social media widgets and RSS links and Large Box Of Male Faces. And flags.

They really need to dump all the irrelevant junk and focus on the content.

Checkout http://ribbot.com