Fuel Cell technology is fascinating as it has potential to provide around 10 times more power than a Lithium Ion battery. Not only can it power it for a fair few hours, the fuel can also be topped up and power to the laptop be supplied on demand. This prevents the need of several hours of charging before a long journey.
PolyFuel are a company based in California who have created a new prototype which converts methanol fuel to electricity. The fuel cell is about the size of a deck of cards and can supply power to a trial Lenovo T40 ThinkPad. Fuel Cell technology is one thing that I cannot wait to see built standard in to laptops. Hopefully PolyFuel have taken it one step closer.