The new blackberry (8330 curve - sprint)  is somewhat fun to play around with. The gps in particular I used to configured a mapping database of my locations - (See links to left "Where's MAP Been" and "Where's MAP Now"). I combined two free API services to get the results. The GPS software and tracking is provided by http://bb.tech9computers.com. This runs in the background on the bb. It checks for a changed position every 30 seconds and sends latitude & longitude updates to their server. My vps checks for changes through their API interface and pulls it down to a local database. When the scripts are called locally (aka, the links on the left are clicked), the database results are pulled and perform a lookup against the Google Maps API (http://maps.google.com and http://google.com/apis/maps). The maps api is highly configurable and essentially just javascript so quite easy to get going. I had some fun with it and plan to look at other fun stuff to do with it. There is apparently a facebook plugin for the tech9 API so I may play around with that too.