If making Mario jump, Kirby suck, and Phoenix OBJECT! is starting to bore you, check out this RoboDS project. It's an "open" robot platform for the Nintendo DS, which comes with a little robot kit, connectors, and a cart to connect it to your DS for programming.
Once you have the whole thing purchased ($99 + $45 + shipping), set up, and programmed, you can control the little wheeled robot from the Wi-Fi in your DS. We suppose you could mount cameras or listening devices on the thing and spy on other cubicles in your office, but having it deliver toilet paper to you on the can when you run out is a much nobler endeavor. Ships April 7.
Product Page [Natrium42 - Thanks strider_mt2k]