The screen and resolution are two things Nokia should be applauded for. Excellent, just excellent. Hardware is pretty good too, I love the N810 form factor. It could be a bit thicker and have a vibrate function and bigger battery though. Oh, and GPS sucks and camera/video is blurry. But the rest of the hardware is gold.
There's even a smaller screen with the same resolution as N800 (4.13" screen) in Toshiba Protege G900 (just 3" screen). ( http://www.gsmarena.com/toshiba_g900-review-185p2.php ). I think there's effort to make Linux run on that nifty device too.
WiBrain has a 4.8" screen at 1024x600... unfortunately it has a clunky body which is not pocketable. It's a shame cause Ubuntu runs really smoothly on that machine.
screen size and rez. is the main reason I got the N770 (and just recently the N800). Only thing I would wish for is a screen that's flush with the case, instead of "sunken".
@anidel: to be fair, they're using a 2yrs old browser, and they haven't played catch up as hard as they have been after the iPhone comes into the market. MS mobile IE has seen quite a bit of improvements, and there are a few 3rd party browsers showing up trying to incorporate better features in the market now. Opera Mobile 9.5 is probably the best, and it has a mobile Safari-like zoom in\out capability.
I personally think the zoom\resize function is necessary for a small, pocketable device, no matter what resolution the screen is. (And that includes the NIT. Which doesn't have a convenient & smart zoom functions yet.)
OperaMini has that neat feature too and it works very well on my SE K630i.
You don't forget you're browsing on a bunch of pixels wide screen, but surely you're browsing experience gets a lot better.