Why is everyone up in arms about aGPS again? The original poster is correct that GPS will be coming to the Mogul in Q4 2007.
While I've had several Sprint employees tell me such, that does not matter. There is a thread, I believe, over at that xda-developers forum and they have determined that the chipset in the Mogul not only supports standalone GPS but something about 4 different modes of GPS.
So don't worry about the GPS functionality not being any good or
only aGPS as it's not.
BTW, Another clear indication is that the Verizon version of the Mogul has the exact same hardware... but they will be offering full GPS support with the device.