Tiny quadcopters will fly into your heart; Nerf missiles your own responsibility
First, they gave us IKEA. This latest creation out of Sweden, though, is infinitely smaller and completely impractical than everybody's favorite home furnishings store, but still as cool as the Scandinavian winters.
The Crazyflie is a small, lightweight quadcopter that measures about 90mm (about 3.5 inches) across, and has a flight time of up to 7 minutes. Developed solely with open-source tools and built with DIYers in mind, the Crazyflie Nano Quadcopter is something every kid, regardless of actual chronological age, would want.
While you can fly it around like any other quadrotor, the Crazyflie ups the ante a little further by existing as a development platform. Think you can affix tiny Nerf rockets to its chassis? You're welcomed to see if you can. Want to figure out a way to auto-pilot the device? Sure! In fact, the developers have been exploring that idea already.
Currently, the people responsible for the Crazyflie are taking pre-orders. For $149, you'll get the 6-DOF version which comes with a 3-axis accelerometer and a 3-axis gyro. For $173, you'll get the 10 DOF version that comes with extra sensors for altitude and heading measurements. Both "sensor packs" come with the Crazyradio USB dongle and a 2.4GHz antenna.