According to ther Windows Live blog, some of the features include:
* A smooth interface that enables you to ask, answer and vote on a question.
* A free-form â€œtaggingâ€? system that allows you to attach your own keywords and phrases to your question to make it more discoverable by other users. With QnA, you tell us what the question is about, not the other way around!
* Integration with Windows Live Spaces via modules that show off questions youâ€™ve asked and questions youâ€™ve answered.
* See your score constantly increase on the Superstars page and earn reputation stars for consistently giving great answers.