FAI multi-distribution
Status
FAI can install different Linux distributions like Redhat, CentOS, Scientific Linux Cern, Fedora, openSUSE, SuSE, Ubuntu and of course Debian.
Read the announcement including a small HowTo.
Distribution specific stuff
CentOS
FAI 3.4.8 and the config space examples from 4.0 can install CentOS 5 and 6. Works with CentOS 5.6 and rinse 1.8. More documentation will apear on the mailing list. Ready-made basefiles are available at http://fai-project.org/download/basefiles/.
Scientific Linux Cern
FAI 3.4.8 and the config space examples from 4.0 can install SCL 5 and 6. Ready-made basefiles are available at http://fai-project.org/download/basefiles/.
RHEL5 and 6
Redhat Enterprise Linux 5 and 6
This should work in the same way as CentOS and SLC.
SuSE
A more verbose description on how to do this with SLES9 is available here
Bootstrapping the base images for other distributions
Have a look at examples/simple/basefiles/mk-basefile. Works for Ubuntu, CentOS, SLC. For RPM based distributions it uses rinse, which also support some old versions of OpenSUSE.