So the title is a little misleading, but after you see the finished product (or read my explanation) you’ll understand.  These guys built a Lego robot that can be operated via the iPhone.  They’ve incorporated the Lego Mindstorm’s light sensor which scans the iPhone screen sitting in its cradle.  Meanwhile the user sends commands from another iPhone via Safari, which ultimately changes the gray scale on the screen telling the Lego Mindstorm’s sensor what command to execute.

Still not as cool as the Lego that solved the Rubik’s Cube.