The TrivialGPS is a small application that shows yours location plotted against a MapView in real time. It uses the mock location provider that ships with the Android SDK. The mock location provider simulates a drive in the bay area.

There is an accompanying tutorial: http://jasonhudgins.blogspot.com/2007/12/cruising-around-with-android.html

http://code.google.com/p/trivial-gps/