First time homebuyer tax credit -- check in hand!

Today, 26 April 2010, nearly 8 months after I closed on my town home on 28 August 2009, I received a check in the mail from the IRS. My amendment of my 2008 federal income tax return was approved (presumably after they verified that I do indeed maintain a principal residence in the US), and the IRS mailed me a check for $8000 + interest. After waiting for quite a while, now I get to decide what to do with this new cash infusion. Any suggestions?