I have had my G1 for a couple of months and downloaded GeoBeagle. Pulls up the local map and loads caches just like on the regular site. I haven't determined how to navigate with it yet. I run the GPS Tracker and Orienteer and haven't figured out if it will all communicate together somehow. The GPS Tracker is very accurate here in Orlando, it would be awesome if we could get it to navigate to coords.
Anyone had any success with GeoBeagle?