I've got a TC 4400 fully spec'ed out.
Specs are as follows:
Core 2 Duo T7200 at 2ghz
4GB of Gskill Ram
160GB HDD, with Ubuntu installed (digitizer works with pressure sensitivity)
Wacom Touch Screen with 512 levels of sensitivity (this is a pen driven touch screen which reacts to how hard you press on the screen, great for artists with Photoshop or PaintTool Sai)
I installed a bluetooth adapter in it since it originally didn't come with one, but had a port for it.
Wireless B/G Internet adapter.
The battery is an ebay battery and is in need of replacement soon. Holds charge for about an hour.
This setup also comes with a docking station which allows you to install an external dvd/bluray or w/e laptop styled drive, as well as has more connections for the laptop. Both the laptop and docking station use separate power cables (three included), however if docked, you only need to use the docking station power cable.
I am asking $200 for everything. ($200 shipped for CL brethren).
So you get:
TC4400 tablet laptop
3 Power cords (2 for laptop 1 for docking station)
(One of the cords is finicky though).