It's available with Windows XP, and I think you can install anything that's compatible with the OS - either via download or by connecting an external drive. Yes, it will support a keyboard, mouse and also a larger monitor.
Battery life depends on your model. The 4G Surf has a battery life around 2 hours; I opted to pay a few bucks more for the one with a 3.5 hour battery.
If you're on the road a lot, it's a simple matter to get one of those doodads that make your lighter plug into a regular electric plug - we have one and it works great. Easier than fiddling with car adapters for everything.
Apparently you can do a whole lot more with it if you're familiar with Linux, which I am not. Check out asus.com and eeeuser.com for more info.
Our only complaint is that we can't play on Webkinz because of screen size issues. There aren't even any scroll bars. But most sites don't have a problem. I've gone just about everywhere else I need to go on it, including this board, Web CT for school, news sites, etc. Yes, a little bit of scrolling is needed, but once you get used to it, it's not that big of a hassle. IMO the size of the cute little thing is well worth putting up with the other size issues.
