Read about Microsoft Surface today, which looks like a very interesting and fun platform to play with.
The concept is using multitouch (more than one pointer on the screen, just like what Steve Jobs showed with the iPhone) on a big touch screen to navigate a delicious user interface built with WPF. In addition, a system utilizing invisible ink to tag devices like cameras and smartphones, is used to make Surface interact with devices and objects from the real world.
Microsoft says that the hardware will be kind of expensive (in the $5K-$10K range). What I really would like to see is Microsoft Surface running on a TabletPC with lots of cpu and memory. That would be a nice way of using my Toshiba Tecra M4...!