I used to have one of those guestmap things, and I got a few dozen people to mark off their locations. I’m not sure what happened to it or where it was hosted. Here are a couple of alternatives; feel free to mark yourselves. The first one is based on IP address and may or may not be U.S.-only, I’m not sure. I’m pretty sure the Frappr map is international.

Put Your Visitors on a Map!

(I suspect the Frappr one might not work on LJ, but if you want to add yourself to my Frappr map, you can do so here.)