While I was researching my laptop buy, I read a lot of reviews, and even the comments after the reviews.
The common problem is it becomes very difficult to get a straight comparison of light/ultraportable/etc computers.
HTC Touch cellphone (WM): +light, inexpensive; - onscreen keyboard, micro SD storage. ok battery life
iPhone(OSX): heavier, twice the price, external storage?, good battery life
The Nokia N810(Debian) same as iPhone, slightly larger, real keyboard. ok battery life
The Asus eeePC (Slackware?) much larger and heavier, same price as iPhone, looks like laptop...shorter battery life
Macbook Air (OSX). Most expensive, about the same weight as eeePC...no optical drive, good battery life, but internal only.
Dell M1330 (WVP). Less $ than Air. Half a # heavier than Air. Battery life between eeePC and Air. Other than that out performs air. has optical drive...external battery
Dell Vostro (WXP?). cheap, fast, heavy, ugly. other than that, about the same as the M1330
I think the point was made...there are a billion choices out there. Size, Performance, 3-D performance, battery life, Operating system, features.
It is pointless to argue which one is better...it only matters if it is better for your purpose.