Gabor Horvath, the master of small scale RC trucks and buses, is the builder of this fantastic remote-controlled Mercedes Citaro articulated bus. The vehicle is only 6 studs wide yet contains 2 PF M motors, 1 PF IR receiver, 1 battery box and all the gears necessary to provide public transport in a LEGO city. Some more views and a video:
Note the heavy use of upside-down techniques at the front and back to get the typical shape:
More pics and complete LDD instructions on MOCpages.