It sounds nice: Turning your notebook trackpad into a gesture area for shortcuts, like instantly searching, with a squiggle of your finger. But you have to learn a whole series of strokes, so it's like Palm Graffiti all over again.
In practice, if you learn all of the gestures, it basically works like Quicksilver on a Mac, except with a trackpad instead of a keyboard. Press a button to activate gestures, then draw what you wanna do, which, theoretically, happens instantly. The onscreen graphical pop-up even kinda looks like Quicksilver's. But it's not nearly as fast, and it's kind of a strange abstraction for a laptop that's one step to the side, and two steps backward, with your shoelaces tied together.