Wacom just introduced two new Cintiq tablets, and the most interesting model is a portable. All I can say is, wow, it looks terrific! (In addition to my wife, it appears to be something to drool over.) I'll have to add it to my new technology list for next year's tax write-offs.
I currently use an Intuous 3 every day with my desktop Mac. I also use it with my MacBook at night on occasion, just sitting on the couch next to my daughter. (If I have tight deadlines, being at home with the family is better than working long hours alone.) I also then bring the Intuos and MB along with me when traveling to take care of clients while away. It works very well, but it takes some initial adjustment to draw with your hand on a tablet in front of you, while looking up at a screen several inches away.
This sort of a tablet would allow for more direct hand-eye coordination, and given its relatively tidy size, I imagine it work well in and out of the studio. $1000 seems a bit steep for such a small unit…but then again, it’s about half the cost of the full-size model. It's sure to sell — and like the Intuos, it has no real competitors in the market.