Saturday I reinstall my new Asus EEE PC 900 with eeebuntu. Really easy, just think that you use the 16 GB for the root partition, the 4 GB is really to small.
I use Unetbootin for the creation ob the USB Stick, download the iso from eeebuntu.org. Then put the stick into the usbslot power on and press ESC ESC. The boot menu pop up use the USB Stick to boot and following the instructions.
For the Rest of the Installation use the Howto on http://www.howtoforge.com/the-perfect-desktop-ubuntu-8.10