Keyboard and mouse controls got you down? Yeah, didn't think so. But if millimeter precise motion control sounds like an interesting way to play Valve's first-person puzzler Portal 2, you might want to buy yourself a Razer Sixense.
Razer's motion control scheme for the PC, which uses a magnetic field to track a pair of controllers in a 3D space, will be supported in Portal 2, giving the game a unique "console-like" experience. (We played with the Sixense controller at CES 2010 with a custom build of Left 4 Dead 2.) You'll see that there's a little bit of lag in interpreting real-world movements, even when the Sixense controllers are wired to the magnetic field base station.