linuxgeocacher is demonstrating an application of NXTControl for remote controlling a Lego Mindstorms NXT robot via an Android powered mobile phone. The difference is that you no longer need an intermediate PC, you can directly control the NXT via Bluetooth. All you need to have is an Android powered smartphone with at least Android version 2.1. There is also an Action-Button for doing other things than moving around.
Instructions and source code can be found here.