If you receive a lot of calls from abroad and if you happen to be a Treo 600 or 650 owner, you may want to try
TreoAreaCodes. It is a small utility that shows the caller's country/state location, his area map, and more (all of this given that his number is transmitted, of course).
A trial is available, the full version hasn't been released yet.
[via
WM247]