The Address Book application in Mac OS X includes a handy plug-in architecture making it easy to extend. One of the features in 4.0.6, the Tiger version, is the ability to show a map for a contacts address. Unfortunately, the map service used is AOL’s rather lame Mapquest. Apparently, Apple has switched this to Google maps in Leopard. I have created a plug-in which allows you to use Yahoo! Maps as an additional option.

What’s new in this version:

Version 0.1.1: Now a Universal Binary.

Website
Download Yahoo! Maps Plug-in