A modbook, wacom cintiq, or maybe setup a hackintosh system on a tabletPC.

It seems that MS inking technology is a few steps in front of Mac, especially with their TabletPC push a few years ago. Who knows what Apple is doing inside their labs with a yet unannounced product...

Inkwell vs Vista's HWR:
http://inkspatter.blogspot.com/2008/...cognition.html

MS next gen ink interface:
http://research.microsoft.com/inkseine/Features.html