AndyM made lots of good points.
I am the owner of 2 Asus EEEs and an Acer Aspire One. Both are the Linux version. Unless you REALLY have a need to have Windows I think the Linux versions are amazing.
The first Asus EEE has a broken screen as I stepped on it by the bed!! The second is my girlfriend's and is used as an extra pc for casual browsing. I took one on tour in Portugal in March and it was fantastic. I tmeant I could sort my photos out, rename then etc all on the PC, and also email updates to my crazyguyonabike site. The Acer also has a multi card slot so you can plug your camera card in the side. I also managed to get Skype onto it for free calls home (it is preloaded on the Asus)
Whilst I was madly recommending the Asus to all and sundry I then got the Acer to replace mine. The Acer looks massively classier, has a bigger keyboard (the Asus is fine even so) and the screen is much bigger. The only downside is a heavier power pack and a heavier pc. Totals are something like 930g vs 1350g (both inc power supply)
Battery life is not great - maybe 1.5 to 2 hrs, but the clever thing with Linux is that it goes from off to 100% on in about 20 secs - none of this Windows rubbish waiting for hours. Even with small RAM etc compared with Windows laptops they both seem very fast. They get Open Office preloaded.
Don't worry about hard drives being small - you can add an SD card plus as many USB sticks as you want.
Either is great, but I am happy to have the Acer in preference to the Asus. Much heavier than that would be a problem for touring. The Asus came with a plain snug neoprene sleeve which I can in fact squeeze the Acer into as well.
If anyone wants to buy the broken Asus (works fine plugged in to an external screen!) let me know