I got in on that bluetooth Belkin deal where the receiver and software cost $150 (regular price $300.)
So far I'm not really impressed...I think the software has issues with my PDA (stupid Samsung processor, NEVER buy PocketPC unless it has Intel Xscale!!) I have to hard reset before I can use the software, and even then it sometimes locks up. Not convenient when you have to reset your pocketpc at 75mph!! Also its not good on long trips unless you have some sort of powered cradle for your pocket pc, and it has to be in a place with low glare so you can read the screen (even transflective screens aren't very readable under direct sunlight.)
BTW, my PDA is an hp 1945...with plenty of free memory and a 512MB SD card. I'm thinking of selling it and getting a 44xx (whatever the thinnest is.)
Edit: I should clarify that the lockups only happen after 2+ hours of driving, and aren't frequent (after a reset its good for another 2+ hours or more.) Other than that, the Belkin software's pretty decent (they licensed it from a major vendor.) You can load maps either by state, by county, or within a radius you select from your home city. If you've got flash memory it can read the files right off there, and the map loader software on the PC can copy direct to the flash mem if you've got a flash read/write thingy (so you're not stuck with USB 1.1 or bluetooth if that's all your PDA has for data xfer...map files can be 150MB+ with multiple states.)
Also, the software links with your address book, so you can lookup a contact and plot a route to their address without tapping it in. The software mimics the GPS software you'd find in a car, so you can set daytime/nighttime mode, and it gives voice prompts etc.