This one allows you to create a map of the US highlighting certain states. It's intended to be "states you've visited" such as this map below. I have visited all the states in red.

Or it can also be used to show "Here is where I live!" (the green state)

create your own visited states map
or write about it on the open travel guide (via the Volokh Conspiracy)

UPDATE: On that note, I've also been to these countries...

UPDATE II: I deleted the images because the website serving them is JUST TOO DARN SLOW!
posted by Tim at 3:38 PM