Got handed a one-dollar bill in change at the Hitchcock Clinic cafe (buying some coffee before an apppointment this morning). Had "www.wheresgeorge.com" stamped in red on it.

Interesting concept -- tracking currency. Unfortunately, one can't track just any currency... only the ones you find and enter into the database. And the hope someone down the line does the same, so you can see where it went (or came from, for that matter). I don't see this as a website strategy that will succeed, given it's running on the now-debunked concept of advertising paying for traffic, but it'll be fun to use while it's still around.