Microsoft has launched a all new QnA site located here. Here are the words out of the horses mouth...
A little background…
Once upon a time, there was an intern at Microsoft who had an idea for getting people answers to the questions they needed. He nicknamed it the “hyperengine” and everyone in Web Search used it for internal projects; it was way cool. Then, when he went back to college, the internal discussions started. Shouldn’t we be building a real one?
Grassroots momentum continued and eventually Windows Live QnA was born. We hired the intern back (yes,he graduated) and got another college hire to be core developers of this new idea -- creating a question-answer engine driven by the people.