Ah I understand the comment now RPM9 re: LEGO robotics. We haven't done it in a club, only at home so we have one robot for each kid. We also have the LEGO simple machines kit and the LEGO science and tech kit (renamed Motorized Mechanisms) and the boys love just building contraptions with those. I regulate those as to not have any missing parts but they have a huge Box for blox full of bricks to build with whenever they want to. My 4yr old wasn't so much into building his own robots, but he had great fun building Tri-bot and programming it. He took to NXT-G, like a fish to water, lol.
WOW on the manual and automatic transmission!!!