I also tried astro launcher which does work. but in the end, i installed GPSgate to prime TomTom. There is a 15day trial to play with the product and Its $14 which is a reasonable price. and i most like the fact that you could configure it to autostart during any soft reset. So its in on all the time. additionally it creates a icon on the bottom bar that changes colors to notify you what kind of GPS signal you are recieving. the icon is Red for no GPS , Yellow For Searching for satellites, or green for Seeing satellites and having a fix. which is very nice info to have on the main screen. The icon let you know if you have a Satellite fix before starting TomTom, Google maps, Live Search. which is nice.
http://gpsgate.com/index.php?id=7