FYI - I just added a program and .cab file to this thread:
http://forum.ppcgeeks.com/showthread.php?t=50897
It is a modified version of Sveinung Bakken's CallerUtility (from
http://forum.xda-developers.com/showthread.php?t=424923) that does an area code lookup in our registry (instead of going out to the web to get address info).
Hope it helps someone.. if not, it was still fun to try my hand at WM6 dev work...