At this year's Game Developers Conference Sixense Entertainment has announced a new motion-sensing game controller Razer Hydra for the PC. This controller is similar to the other motion controllers such as Wii, Move or Kinect, but unlike these it promises a much better precision through the use of magnetic fields. Thus, this controller is well suited for many PC games.
At the beginning the controller supports, in co-operation with Valve, games like Left 4 Dead 2, Half-Life 2 or Team Fortress 2 and promises support for their future titles like Counter-Strike: Global Offensive and Dota 2.
And what does this have to do with Linux, you ask? The controller supports Linux, and even offers an SDK for Linux for download.
There's also a standalone version of the controller and a bundle with Portal 2 for about $100 available at RazerStore.
A complete press release to the announcement of the controller is here.
And here is a video of Skyrim played with Razer Hydra.