you might want to look...
at the Alienware mx11 netbook. Small, light , good battery, silly lighting effects, and can run crysis easily at full detail settings :) If i didn't already have a wind i'd have one of these winging it's way to me already.
Netbooks have moved on from their original purpose as net appliances, they are now just ultra portable laptops! Even my low spec MSI wind is a higher spec than my 7 year old gaming laptop (aside from the graphics card, which admittedly, makes a massive difference)
They excel at exactly what they were designed for, they are small and very portable, but still usable! I can just pick up my netbook in a morning, and chuck it in a rucksack with the rest of my work gear, no 'please mug me' laptop bag necessary*. A mac air might also satisfy that, but it's still bigger, and thin enough to worry about breaking.
They aren't meant for gaming, but with a bit of effort (intel graphics are fun) you can get them running anything a few years old quite comfortably, you'll have more issues with the widescreen display than with the power of the thing.
*If you've ever worked at a company that went for cheap office space, no matter what, you'll really appreciate this one. You're lucky not to be knifed for your shoes outside some of our places.