Went to Pizza Hut for dinner, walked out with my change after picking up my pizza. Got home and put money in wallet and noticed some red lettering around the Federal Reserve seal. Took a closer look and it's stamped "Track This Bill! www.wheresgeorge.com"
So I take a look. Pretty neat site... I guess I'm a bit behnd the times though, as it has been operating since '98.
Doh, I really should get out more often.