I'm also a loyal Garmin user. Garmin for GPS is right up there with Blackberry for me in terms of great devices. That said, Garmin has a microSD solution for Windows Mobile devices. The link you listed for the 8100 is their web-based solution. I would be less inclined to endorse their hosted solutions as I would their devices and software. So, just to add another opinion here, if it's a matter of choosing a hosted solution, I won't be going with Garmin. But the day they produce a microSD product for Blackberry, I'm all over it!