I've been musing abit on that Moto Atrix laptop (and similar solutions), why not use the phone as the trackpad?
Why dock it at the rear, a position that makes the laptop solution cumbresome to carry around inbetween meetings/classes. The phone functionality (while carrying the laptop around with the phone "hid away") could be handled by connecting a handsfree with a small screeen attached that showed you the caller info. When the screen's flipped up that info simply goes into a popup window.
Superficially it seems like a nice solution, the laptop bottom part doesn't need to be much thicker than the phone to allow the dock, 2.5mm would most likely more than suffice. Add two spring loaded arms to hold the phone in place and there you go.