http://www.wheresgeorge.com/

(and it's just a first name, e-address, and password for registration...I sent my first bill (well, george) on his way...)

http://whereswilly.com

isn't there "Where's Bolek?" site??

Yes! went there about a year ago and jsut check on "my" dollar bill. Here's the message I received
Congratulations! You are tied for First Place
among all the users that have no George Score yet.
Hey, and it was a new bill, too.