The aGPS works perfectly with Google Maps, Live Search and Amaze GPS (All of them require data plan). It does not work with stanalone GPS softwares which require NEMA protocol (eg. iGuidance, ? Garmin, TomTom7, iGo8 ect..). There is an application called as GpsGate from Franson which provides virtual COM ports and forwards aGPS info in NEMA standards. I'm using its trial version and it works flawlessly with iGuidance. Its express version is only $13. Not bad in my opinon!
http://franson.com/gpsgate/download....platform=winxp