Last week, Google thought it'd be funny to have an April Fool's gag based on Kinect powering, of all things, Gmail. Well, turns out you can actually do that.
A research team at USC already has Kinect running Google's email service, and as you'll see in this slightly stupid video (it's keeping things in the spirit of the joke), it actually works.
While the text entry will obviously need some work, the "send" command is one that all motion-based devices should make use of in the future. Provided Kinect can accurately track an arse, that is.