MyTrackingOnline

Real time GPS tracking. The phone sends GPS reports to the map server where the tracks can be viewed on various maps including Bing, Google, MapQuest, and mobile maps. The software can upload photos to the server and the images will appear on the map near the GPS track where the photo was taken. If coverage is lost, the software will store the tracks and upload them when reconnected. Geofences, multiple accounts on the same map, and many other features are supported. Runs in the background and continues to update the map server even when the phone is locked or "sleeping". The audio of the phone running ATracker can be monitored remotely (check local laws before using this feature).

The waypoint system is great for geoCaching.

A free account on the MyTracking server required. Visit http://mytrackingonline.com for details. Email info@mytrackingonline.com to request a free account (personal use only; 2 accounts max).

A PDF manual can be openned here:
http://mytrackingonline.com/DroidHelp.pdf

Works on tablets too. If the Market doesn't show a download link for your device, it may still work. You can install it directly from here:
http://69.64.48.92/atracker.apk