Thanks to Robert H for the heads up on BPN :)
Well, Paul Thurrott - yup, spelt correct - has done it again and pulled out an in depth review of Windows XP Tablet PC Edition on winsupersite.
And I quote: "It"s the best Windows yet. Will anyone use it?"
A Tablet PC is a PC or, more appropriately, a portable PC. It has been modified at both the hardware and software levels, however, to differentiate it from other PCs. Tablet PCs are ultra-mobile laptop computers with convertible screens that can be used in normal laptop mode, or flipped around and used like a tablet, with stylus and on-screen keyboard input. A second hardware design, simply called a tablet, uses a docking station to provide keyboard and mouse access; when away from the desk, the tablet is used with the stylus and on-screen keyboard only.
Tablet PCs ship with a special version of Windows XP called Windows XP Tablet PC Edition. This XP version is available only with Tablet PCs, and is based on Windows XP Professional Service Pack 1 (SP1). In addition to the standard XP Pro features, Tablet PC edition includes support for the active digitizer and stylus used by Tablet PC devices, instant display switching between normal and portrait modes, and a small suite of Tablet PC-enabled applications, including Windows Journal, Sticky Notes, a game, and an Office XP add-on pack.