Sounds interesting though no confirmation from what I can see that it will work on BBs.
Garmin's Mobile XT turns your phone into a GPS superstar - Engadget
Garmin Mobile(TM) XT: Plug 'N Play Maps for Your Phone
https://buy.garmin.com/shop/shop.do?cID=138&pID=11413
for 99 bucks and no subscription preloaded on a microSD card? Wow. Now if only my GPS signal didn't keep dropping on my 8800
UPDATE:
The Garmin Mobile XT product mentioned in the above links DO NOT WORK on BBs according to the Garmin product support center (two calls just to confirm).
It will work in other phones that run Symbian, PalmOS, and Windows Mobile.
So, looks like a Subscription based, OTA service is all we get. Poop.