From this year’s Best of What’s New:

Innovation begets innovation. Efficient thin-film solar technology leads to panels so inexpensive, they could blanket city skylines. GM atones for killing the all electric EV1 with the plug-in Chevy Volt Hybrid. The iPod begets the iPhone. Click around to see these and 97 more of PosSci’s picks of the latest revolutionary technologies that will drive the next 20 years of innovation.

I agree with PopSci‘s 1st place choice, but I also really like the Infinitely Geared Bike.