Multitouch
I've mentioned Jeff Han previously, but his new work has me dribbling. I'm interested because I loved the 'feel' of the multi-touch technology used in the now-bought-by-an-unknown-company-and-killed touchstream keyboard, and Apple has a patent on a multitouch tablet - consumer level multi-touch screens could lead to some corker applications, as Jeff has shown.
Bring on the hotness!