Bit Tech reports Razer showed off Hydra, a motion controller for the PC that looks similar to Sony's PlayStation Move. The technology behind the controller is being developed by SixSense, it uses a small electromagnetic field generator that picks up motions from the two wired Nunchuck-like controllers. Hydra is expected to be released later this year.
Moving the controllers disrupts the field, allowing for a very precise in-game movements, and without the need to stand 10 feet away from your monitor. The technology is being developed by SixSense, and was demoed extensively using a build of Valve's up-coming first person puzzler, Portal 2.
We were shown the Hydra performing feats of surprising accuracy, such as threading a companion cube through a small space and resizing in-game objects to solve puzzles - a new feature for Portal 2. Razer also stated that Valve planned to release special, motion control only levels in Portal 2, which would come bundled with the controller. Support in other games is patchy right now though, with only Left 4 Dead mentioned as another compatible title.