You can use it to scroll around the XMB, surf the web, or whatever. It just looks a lot cooler than a normal mouse and since it isn't a PS3 controller, impresses friends when you mysteriously have the ability to access things on the PS3 whilst your controllers charge in plain view. Apparently, the buttons on the Space Navigator have the same effect as the X and O buttons on the DualShock 3. This means you could probably use this (or an ugly, normal mouse) for simple games like Everyday Shooter or PixelJunk Monsters. Sort of. Still -- there are a ton of peripherals that work on the PS3 and it's good to see yet another in action.