Motorola just added a USB host capability for the Android 3.1.  Users can now add their PS3 controllers for added game play.

@Yungjohnnybravo @TatWZA

In this video, the user uses their PS3 controller, one of those imported OTG cables and, of course, a compatible app. This might be one of those things that Motorola and Google might want to market to give them one up on the Apple iPad 2.