With your specification, the WORLDS MOST ADVANCED LAPTOP will have 45 minutes battery life.
Surely the world's most advanced laptop should have power AND longevity? How about a 2ghz Dothan processor with 533MHz bus speed and 2mb L2 cache (out in Q4 this year)? This will be the equivalent of a P4 4ghz processor. And it wont burn your legs. And you can watch a dvds on it when on the train and you will actually get to the end. Advanced, huh?