TabletPC

Lap Top with detachable/flippable TouchScreen. Runs MsWindows XP.

http://www.microsoft.com/windowsxp/tabletpc/default.asp

Known in particular for its OneNote program. But some think it's better for reading than any other activity.

I may avoid it because it would be pretty impossible to run LinuxOS on it, but on the other hand you can run X Server-s on it. Though that rather tethers you to a base machine running LinuxOS on your network.