Question #1: My wife and I are planning to buy a house, but we have not signed a contract yet. How much longer do we have before the Federal credit expires?
Unfortunately it looks like you have missed the deadline. In order to qualify for the credit you would have needed to be in contract by April 30th, and you need to close escrow before June 30th.
Question #2: I got an email saying it was from the IRS, but it asked me to respond with my Social Security Number and other personal data. Is there a new scam going around?