As i'm soon to be upgrading from an ancient Toshiba Equium to a MacBook, i've been thinking about this for a bit.
In terms of size, I think we've hit an optimum, 13" seems to be the best for the portable people. 11" has been achieved by panasonic, and any smaller would be impossible to type on and would be pathetic. Those larger laptops have also made up for weight by putting pretty decent graphics cards into them.
Processing power seems to have got to an optimum as well. With Core2 Duo going into laptops, seems like laptops have got as fast as they're gonna be for a while. Untill we invent better chips that don't heat as much, which isn't likely for at least a year.
Ram, up to 4Gb, Say no more.
Overall, I think the improvement of laptops isn't going to advance for a good year and a half, any improvements will cause downsides, most prominently: the cost. Untill revolutions in the technology market allow intel's core extreme chip to run without creating enough heat to cook your breakfast, i think the laptop market will be filled with only aesthetic improvements.
Soz if im a bit pessemistic!!!
well the question is easy, whats the future, will be the tablet pc?,smarth phones, pda, the ultra portable "aka" origami ones, or just the normal notebook we know?