I just made a very basic MoosTrax location updater for the iPhone. Currently it just sends your location to MoosTrax when you press the Update Now button.
I will be adding push notifications soon so that when someone pulls up the Live Tracking page on the MoosTrax website, you will receive a notification on your iPhone requesting you to update your location. That is really all I can do for now, as background applications are still not permitted.
If anyone wants to help me test this first version, please email email@example.com.