A couple of years ago I imported some small GPS devices that connected via USB and managed to get them working on a pocket PC (iPaq). Well finally you can buy them as integrated devices. The Navman PiN runs PocketPC 2004 and has all of the usualy PDA functions as well as SmartST mapping software and maps for the country you purchased it in.
I used the PiN for a while in the car but the power connector got damaged quickly and the windscreen mount was less than ideal. Shortly after this Navman released their new removable in car device the iCN 510 which I must say has a much better windscreen mount and a proper power connector.
The device runs WinCE and boots directly into SmartST so I doubt I can run anything else on it but at least it’s usable in the car. Now I just have to find a home for my PiN.