Well, My XP Pro install couldnt have gone more smoothly... nlited out all the nonsense (legacy drivers, media centre components, movie maker) and disabled a load of useless services. I should highlight that this was VERY easy with Nlite (happy to provide the nlite config for anyone who wants it!).
Installed size it a hair over 1GB.
First thing to do once it boots up for the first thing is to ensure that Swapfile is disabled (saving space and protecting the SSD drive). Also, consider disabling the indexing servince, system restore, and backgroud defrag. All of these will otherwise:-
A) Use memory
B) Use Hard disk space
C) Use CPU Time
D) Eat idle battery
Now... my eee is running (with all drivers) at 0%CPU idle, ~90meg Ram usage, and is EXTREMELY reponsive.
I feel that despite the solid percentage, the el'reg reviewer is beating down on the unit a bit hard. Contrary to most users, I found the built in "appliance" frontend a bit crap, totally locked down and generally unresponsive in opening apps. It also runs at 256 meg idle ram usage!
the 900mhz (actually running at 630 due to lowered FSB bus speed!) CPU copes beautifully with a neat XP build, and the 512mb of ram is also perfectly adequete (without any swapfile noless!). No doubt I'll look at sticking a 1GB or 2GB chip in there at a later date - but not as soon as I expected I'd want to.
Finally, I want to highlight that for a mere £220 quid (inc vat!), I have a responsive, unbeatably versatile, eye catching, highly mobile device that delivers a solid 4 hours usage (with wireless disabled and screen at a readable 60% brightness) and which I can slip in my bag for plugging into remote networks, Cisco switches, light web usage (as previously mentioned, a hell of a lot better than a 320x240 phone screen!), light picture manipulation and office app usage, and really whatever else I find I need it to do while on my travels. I feel that Asus have missed a trick on this one - its being pitched as a mobile web access machine, but its real calling is in the hands of IT users who'll stick on a real OS and wiil be using it to run hyperteminal, RDP onto servers, and as a troubleshooting terminal while out in the field.
PS - Did I mention that the mains adaptor isnt a block - its like a Nokia phone wall charger! - hardly a nightmare to carry around!