Fuel-cell powered laptops.

Toshiba:

Toshiba Corporation today announced the world’s first prototype of a small form factor direct methanol fuel cell (DMFC) for portable PCs, a clean energy breakthrough with the potential to end reliance on rechargeable batteries. The new fuel cell currently realizes average output of 12W and maximum output of 20W, and can achieve approximately five hours of operation with a single cartridge of fuel. It provides instant power supply, and achieves significant advances in operating times with replaceable methanol cartridges.

Via Boing Boing.