I am assuming you have been able to get hold of an EeePC, and
know how evilwm works.
Update Apt
Become root and add this line:
deb http://http.us.debian.org/debian stable main contrib non-free
to:
/etc/apt/sources.list
Save the file and type:
apt-get update
to update the list of available packages. Then install EvilWM:
apt-get install evilwm
Exit the root shell and you'll become yourself again. Now type:
cd
wget http://www.6809.org.uk/evilwm/xinitrc -O .xinitrc
Re-boot the EeePC (X went a bit funny when I just re-started it. If you need to go back to KDE just rename the .xinitrc file.