Mattel demonstrated the toy at a recent toy company conference. It's coming out this year, sometime between next month and Christmas.
It's called MindFlex and it measures theta-waves in your brain, to power a fan, which causes a foam ball to hover, higher or lower depending on how much you're concentrating. It's pretty neat, but it's gonna cost about $100.
Here's a picture:

Here's a video demonstration:
http://www.youtube.com/watch?v=q6RCACuNEbY&feature=fvst
And their website (nothing on there yet, though):
http://www.mindflexgames.com/
Are we going to see more post-modern peripherals like this? You know... No more remote control for the TV, no more keyboard & mouse, car keys, light switches or even a clapper... Everything in the future will use WIRELESS electricity and be controlled by voice-activation, spatial recognition software recognizing your movements, and miniature EEG machines that utilize the power of thought itself!
