CfE stands for “Clusters for Everyone” and is an effort to make a Linux distribution tailored for clusters. CfE is also an “approach” to a particular problem: storing the root filesystem for hundreds of nodes in an efficient way and also making the configuration and maintenance simple. CfE is a valid approach not only for clusters, but also, for example, a classroom.
Here you can find an article about CfE
Here the slides of my talk at LinuxDay 2008 in Udine
Here the initrd and some other things needed to make a basic installation of CfE. Be warned that the package contains nothing to be considered production-quality, but only some tools that helped me getting the job done. To understand how the whole thing works, you can start by reading the init script of the initrd, and then the file utils/ecs-install.sh. Yes, I know that it is not easy to understand the code of others, especially if it is very bad such in this case 
So feel free to contact me for every question
The whole thing works on CentOS 5.1
Hopefully, some day CfE will become something better and user friendly
CfE is hosted on SourceForge: http://sourceforge.net/projects/clustersfe
There is also a mailing list: clustersfe-discuss at lists dot sourceforge dot net