Here's a pretty cool guide to tweaking the Eee:

http://www.notebookreview.com/default.asp?newsid=4062

Installing WinXP is easy provided you have an external DVD drive (apparently some essential apps are on a supplied Asus DVD). It boots pretty damn quick too, as you can see from the video on the page. Memory expansion is also cheap and easy, although the solid state storage device is soldered to the motherboard.

The Eee really does seem to hit all the right buttons. Apparently they're selling six every second over in China.