I have a TomTom One V3. Bought it on eBay for $75 shipped. I like it because it's very moddable. I cracked it open, soldered in a 4GB SD card, then upgraded the bootloader, loaded Tomplayer, and Navcore 8 with version 8 maps, so now I have a TomTom that can play MP3s, videos, and has text-to-speech (tells me the road names), and Advanced Lane Guidance (tells you exactly what lane to be in). There's still more I can do with it too.
I personally think MS is grabbing at thin air, and trying to kick TT while they're down, so to speak. MS has already been warned (a couple of times) about non compliance with anti trust sanctions (aka being too much of a monopoly). Do they really need more money? Yes, a patent is a patent, but man, some of those patents are analgous to one of us saying "Hey, you can't use that shovel... I've patented that method of digging".
I'm even further disgusted with MS, and even more hardened against them.
Sad thing is, my name is Paul Allen... Heh, no, not 'THE' Paul Allen... :o)