I started doing Where’s George a couple years ago. It is a site that allows you to register your currency so that as the bills travel around, you can see where they have travelled. I rarely enter a bill – just whenever I think of it, but in that time I have entered in 72 Bills worth $2,726.
Just now I got an email notifying me that one of my bills has been entered in by someone else. A $1 bill that I entered November 14th, 2003 was registered in Newport, NC today!