Tor Map Project
Three maps are currently available for you.

A map of all Tor routers. This map displays every city with at least one running Tor router.

A map of all exit nodes. This map shows every city with at least one running exit node.

A map of all authoratative directory servers. This map shows every city with at least one authoratative directory server.

Bandwidth map. Reflects how much bandwidth cities provide to the Tor network.
Maps are re-created daily.
There is also a (very) rough, but browsable, map available here.
Comments are welcome. If you run a tor node and have more accurate information on your node's location, please drop a line.