Many people are running Windows 7, thinking about upgrading, and some have preordered. With something as big as Windows 7 many people need help. Usually people do not want to pay to get help. The cheapest and likely friendliest form of support is in the question and answer format.
A friend of mine set up a QnA site specifically for Windows 7. It is completely free to use, and easy to sign up for an account. It is the Windows 7 QnA on Ning.
A bit of history:
A while back there was a Windows Live QnA hosted by Microsoft. Many people were asking questions about Windows 7 on it. But when Microsoft decided to close down the QnA those people would not have somewhere to go. So a friend I made on the QnA decided to make the Windows 7 QnA for Windows 7 questions.