IR projection keyboard (http://www.alpern.org/weblog/stories/2003/01/09/p rojectionKeyboards.html)
and a built in projector. That way, you don't have to carry much with you to have a large screen (on the wall) and a keyboard.
Of course, add all the usual suspects, wifi, bt, phone, etc...
I'm sure the projector isn't feasable, but it would be darn cool.