Pluto by Pusher Labs

The Pluto Controller is the ultimate mobile MIDI controller for Lightroom.

Based on the Numark Orbit, the Pluto is completely wireless so you can sit back and enjoy editing without being chained to your desk. It's small enough to toss in your laptop or camera bag to take with you on the go and it takes advantage of PFixers incremental MIDI value and acceleration support: move the dial slow and the Lightroom sliders move in small increments; move the dial fast, and Lightroom makes its adjustments faster. As if that wasn't cool enough, the Pluto has two built-in accelerometers so you can set Lightroom parameters by the tilt of the controller.

It's simply amazing and it's available from the Pusher Labs Store!