The thing with laptops is, if the keyboard is at the right height, the screen is down. And if the screen is at the right height, the keyboard is a little too high. For use on long periods, I'd say a laptop+wireless keyboard (the bluetooth apple keyboard is simply amazing).
I'd agree that the Macbook's display is not the best (it's good, but lacks contrast and such), but I have yet to see another laptop display as solid as the Macbook Pro. That one is a beauty.
The 20" iMac also has a sub-par display (the new one that is, yeah, grapes are sour). Poor viewing angles among others. The 24" has a really good one though.
The trackpad of apple laptops is something to die for. Oh I just can't work with regular laptops anymore. The surface is smooth and oily, and the pointer is jumpy, that is, if you can find your way through the thousands of buttons surrounding it.
@Darky: the Omnigroup has a GTD app that's supposed to be really good. I'm satisfied with things though.