With a little help from RANDOM.org (seriously, a life-saver for book bloggers everywhere), I now give you the winner of Matt Dunn's Ex-Girlfriends United, courtesy of Sourcebooks!
Drum roll, please... Here's what RANDOM.org had to say about this.
Congratulations, Sarah! I will email you right now and as soon as I have your postal address, I will forward it to Sourcebooks. Enjoy the book!