Gestures are not a new thing for laptops, however they have gained more attention as of late due to the gestures introduced on the iPhone. Even so, there were gestures for laptops though they could only be used for limited functions or were software specific.
Now, Synaptics is introducing new gestures for laptops. There's the ChiralRotate, wherein you make a circular motion with one finger, which rotates the screen. There's also the Two-Finger Flick, which can make for sideways scrolling, flipping pages or what have you.