Thames & Kosmos, the folks that make those nifty physics sets we were so excited about a while back, also make the mechanical toy shown here: a remote control machines construction set.
The contains everything you need to build 10 different remote control devices and machines including a crane, race car, bulldozer, robotic arm, plow and an antique-style car.
Included in set are three motors, 182 snap-together pieces, an easy-to-operate infrared remote, and a 48 page instruction book illustrating how to make each of the different models. You can, of course, also invent your own contraptions with the set. The possibilities are intriguing and numerous. You have to love toys that can be made into lots of other toys.
Check out a larger image, and some good reviews for Thames & Kosmos Remote Control Machines Set.