It's speedy mid-range graphics with a power-optimised bent, in skinny notebooks, for gaming and good video on the move. NVIDIA have brought the entire stable of discrete products to the portable market, with them all shipping as I type this, in a bunch of designs from the likes of Clevo, Uniwill, Wistron and others.
ATI are doing much the same with PCI Express, HyperMemory and optimised mobile versions of desktop ASICs. 3D gets ever powerful on the move, and it's good to see NVIDIA push their latest architecture onto devices you can use to play Half Life 2 on the bus.