Dan Miser's has already mentioned it but Microsoft Surface was announced today and looks very, very interesting. I can envision lots of applications of this technology though I've read a $10K price point obviously putting it well out of reach for the average Joe at least for the time being even though the videos portray it being used in a home setting.
I'd like to see this kind of technology applied to software development and can imagine a bunch of developers sitting around the table and actually sketching out UML, designing forms or Popfly mashups. I'll be interested in reading a Tom's Hardware type of review of the device.