I purchased an ASUS Eee PC 900A a few weeks ago and I found myself using it more than my main system.
A few weeks ago I purchased an ASUS EeePC 900A and I absolutely love the little netbook.
The default Xandros install was horrible. It mounts the file systems under UnionFS which blocks you from upgrading the packages as it effectively eats up all disk space if you try it.
Needless to say, Xandros got wiped off the system faster than I was initially going to remove it.
After adding a 2GB stick of Corsair RAM into the unit, I installed Archlinux and never looked back.
I have noticed that I have begun to use my Eee PC 900A a lot more than my main system or my older laptop.
I am preaching to the choir here, but I highly recommend that everyone uses Openbox on their netbook (and heck on their main machines as well :P). A window manager will always outperform a full blown desktop environment on this hardware.