green science toy
It is some injection molded modeling kit that lets you build dynamo, battery from orange, wind turbine, catamaran, crawling coke can, etc etc. Seriously it is quite low tech compared to your handheld game console, cost more than it's worth, but I think it packs more educational values than a PSP or NDS. You can build your stuff and learn science at the same time.
Tell me how many of you rip open your PSP and play with the circuit board inside?