A few months ago, I reviewed Mad Catz's first console, MOJO. While I came away with mixed feelings about stock Android with nothing more than controller input, C.T.R.L.R. itself left me impressed (the name, on the other hand, is terrible). It's packed with useful buttons a-plenty, including full navigation, media, and volume controls.
Now, Mad Catz has released a standalone version of CTRLR that can be used on any Android device (or Windows PC) over Bluetooth.