The Toshiba M400 is a nice Tablet PC and were it not for the challenges of getting good support from Toshiba I would recommend the M400 to anyone looking for a powerful Tablet PC. Of course, I warned my client that as soon as he purchased his new Toshiba M400, Lenovo would probably announce the X60.
You guessed it...
Now that the Lenovo X60 Tablet PC is here, I know which Tablet PC I will recommend. Lenovo's made huge improvements in a several areas: screen (you can now get XGA+ with MultiTouch pen and finger touch capabilities; outdoor wide screen anti-glare viewing available as an option.), memory (up to 4 gigs), disk (2.5" 7200 rpm, WWAN (EVDO) and battery life (up to 8 hours) -- all in a package that weighs between 3.8 and 4.16 pounds.
Many excellent tablet sites are blogging the details, so I won't repeat their comments here.
TabletPCReview as posted a very detailed review of the ThinkPad X60 Tablet PC.
Be sure to check out JKOnTheRun and GottaBeMobile as well.