Other World Computing put out a teaser for their product the ModBook that will be announced Tuesday. It is supposed to be a slate style tablet solution that will even offer a GPS add-on. From the press release
The ModBook is also the only portable Mac solution that features an optional built-in Global Positioning System (GPS). The Axiotron ModBook GPS Module was developed in cooperation with GlobalSat Technologies Corporation utilizing the industry leading SiRFstarÃ¢â€žÂ¢ III chipset for shorter first location fix times and improved tracking capabilities.
I am a huge tablet fan (just upgraded the Toshiba M200 to Vista) so I am pretty curious to see how this goes.