Nope.
But if you're a developer and have an MSDN subscription you can download the
tablet extensions.
You can't even buy XP Tablet PC Edition... so unless you've already got a
disk, I dont know where you'd get it anyway.
Even if you did get the tablet pc edition on the desktop... you're probably
looking to use a wacom USB tablet or some other manufacture... with the slow
sample rate, and the low resolution you'd never get "good ink"...
The sample rate of tablet pc's digitizers are at least 20x that of a usb
device, and the resolution is 3 to 10 times greater than the resolution of
the tablet pc screen... (1024x768 = 3072x2304... 96dpi screen with a 207ppi
deigitizer, roughly)
So it would suck, unless you got the digitizer from one of these tablet pcs,
and made it usefull on the desktop.
-James