These are so cool! They are tiny RC tanks that can shoot at each other via infrared. They have real working treads (no wheels), they recoil when they fire, and they spin around and flash when hit. The controllers keep up with the number of hits and allow you to play different games. You can have up to four tanks fighting at once – you assign each one a different ID. They aren’t officially available in the US yet, so you have to buy them on eBay or from an international retailer (~$50). Internally they are very similar to Bit Char-G Japanese RC cars, which are also quite cool.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1790544656

Here’s a little FAQ about them…

http://tinyrc.com/forums/showthread.php?s=f4f055ef074f883ea2b31f7921661c80&threadid=1251