FAI 4.2 was released today. It now supports ISO hybrid images, which can be put onto a CD or which can be written to USB stick via dd(1).
I've also created new FAI CD ISO images, which are available on the FAI project web page. One installs Debian 6 with a small list of pacakges or a XFCE desktop. The FAI multi distribution CD can install Debian, CentOS and Scientific Linux Cern from one CD. You can download the FAI packages and the CD images from http://fai-project.org/ -- regards Thomas