Youtube link for mobile viewing

This is just the beginning, folks. With the addition of the USB host capability in Android 3.1, we're about to see an onslaught of cool peripherals for Android devices. And here we have the PS3 controller being used on the Motorola Xoom. All you really need, in this example anyway, is a controller, one of those imported OTG cables and, of course, a compatible app. The latter is going to be the bottleneck at first. Write your congressman. Write your developer. And let's get this done.

Source: Booyagadget via Android Central Forums