Fingerworks touchpads allow you to control your computer (Windows, Linux or Mac) using the gestures reminiscent of those in Minority Report movie (although not in the air but on the touchpad surface). It can replace both your mouse and keyboard and requires no software drivers whatsoever (the unit itself generates the keyboard and mouse events and is very customizable). Unfortunately, when I wanted to link to the Fingerworks homepage, I found out the company has gone out of business!
That's sad. I've been using their Fingerworks Mini for several years, it makes my work tremendously easy and I really cannot imagine what I'll do when it breaks down eventually... :( I'll have to look for another cool device.