Geeks are great believers in taking hardware that was designed for one purpose and using it for as many other cool things as possible. Take the Microsoft Kinect. The motion control system has been hacked for all sorts of uses since it launched and none of the other uses are things that Microsoft would have envisioned.
Microsoft has hinted that it would bring support for Kinect to the PC but for now that support is up to hackers like Demize2010 on YouTube. This dude took a Kinect and the remote and nunchuk from his Wii and hacked them all together to allow the movement, aim, and shooting in CoD on the PC with the Wii controls. The Kinect was then used to access other commands using gestures.
You can see from the video below that when he wants to lean to look around a corner, he just leans in real life. Other things are activated by motion as well. This is a really cool hack that uses a couple of things that would be cool on their own, matched up they rock even more.