The Excavator Arm was a quick build done in the days leading up to Brickfair 2009. It was made mostly from the 8258 Lego Technic flagship set (which is clear from the number of red panels it has), but it incorporate some other sets too (hence the tires sitting at the bottom). It has got a number of powered joints and is remote control too! More info is down the road!
STAY TUNED! More details and pictures will be coming soon!