You might want to consider just getting the Lycoris-based tablet PC...
The problem with Linux Tablet support is that Tablet computers are so new, were developed "in secret", and haven't yet had all their functions transfered to Linux.
For example, the "screen flipping" that tablets do is tough to get working in Linux. Handwriting recognition is not there yet (although you might be able to get a system for tapping on a screen-based keyboard), and other things...
See:
http://linux-tablet-pc.dhs.org/