Well, here’s a cool little hack for anyone who’s interested in building a GPS tracker for fun. Although I’d rather stick to my GoogleMaps on my Blackberry, this is good info for anyone who wants to build a custom app.
The Open GPS Tracker is a small device which plugs into a $20 prepaid mobile phone to make a GPS tracker. The Tracker responds to text message commands, detects motion, and sends you its exact position, ready for Google Maps or your mapping software. The Tracker firmware is open source and user-customizable.