I would *strongly* suggest anyone looking at tablet monitors as a replacement for a regular tablet to think twice. Instead of paying ~300 dollars for a tablet that you can use with any monitor you like, you'll be paying 1500-3500 dollars for a built-in monitor that only does like 1280x1024 at 16 million colors. here's a nice one: ( http://www.wacom.com/lcdtablets/index_18sx.cfm http://www.wacom.com/lcdtablets/specs.cfm ).
I really can't see why anyone would pay 5-10 times more for what amounts to a mediocre monitor. I think Viewsonic makes one too, but I can't get their page to load to find the specs.
As far as Tablet PCs, again, I can't find any specs over 1024x768 and the same 24 bit color. Maybe the developers at SD can eleborate if they have any advance knowledge. I found one that would accept a gig or ram, but most are like 512 or less. I would use one for the same stuff I would use a laptop for, but with any kind of graphics work, it wouldn't be worth paying twice what you would spend building a good machine yourself.
My advice, at least until the technology improves, is to buy a good, conventional tablet.