Bigger and smaller computers are a good thing, opening up new types of interactions that are not possible with a 17-22" inch monitor, a 95-105 key keyboard, and a mouse.
I saw one of these being demoed in the valley recently and that was the thing that struck me. "Meh, it's just a big iPhone." Apple have stolen Microsoft's thunder by putting multi-touch in the hands of consumers way before MS did.
That isn't to say these devices aren't fun. They just don't have quite the same wow factor as they did pre-iPhone.
Looks awesome. I wish they would have taken photos that were less 'artistic' looking and more interesting. The photos are mostly of them moving it, then using it at odd angles..
They should really start pushing surface units in different sizes. As amazing as they are (they have one at my uni that i've had a chance to check out), they are pretty big. Right now the size that they are coming in are good for people sitting around the unit touching it and checking it out, but I would like to see what other form factors surface technology can be in.
They also may want to work on bringing the price on these things down too.