The new Hydra motion sensing controller by Razer looks like a promising new way to play PC games. This is similar to the controller used by Wii consoles, only it seems to provide more functionality and precision. There are two controllers to duel-wield, along with a state-of-the-art signal receiver that reduces lag while not lacking performance. It is currently supported by over 120 games out of the box and additional configurations for download.
Take a look at one of the gameplay videos Razer has posted on their site:
Other notable compatible games are Call of Duty: Black Ops, Portal 2 and Mass Effect 1 and 2. Razer is a great company that produces top-notch computer accessories, i have personally bought two mice from them in the past 6 years, and they have never failed. Cheers to Razer, and to the innovation they bring to the PC.