Recently I rediscovered this site, when I found a dollar bill with "WWW.WHERESGEORGE.COM" scrawled on it. It's a fun site, kind of like BookCrossing, where you can track where your money has been and where it goes after it passes from your hands (since it inevitably does, ugh). I signed up for it last year sometime (before that there was no login or bill tracking, you could only see where your bills had been before you), and although I haven't heard about most of my bills, it's still wicked fun. At least, I think so. But then, I'm a dork.