Where Are My Friends is an Android (version 1) application that plots all of the addresses from your contacts list onto a map.

After getting the addresses for everyone in your contact list, WamF places them all on a map, drawing lines that connect you to them. By the time we're done we'll have touched on maps, overlays, Location-Based Services, using native Content Providers, Adapters, the geocoder, and menus.

For a detailed walk-through of this project see the tutorial at Google Blogoscoped: http://blogoscoped.com/

For more detailed walk-throughts, examples, and other information to help developing applications for Android, check out Professional Android Application Development by Reto Meier.