CentOS as a Replacement for RHEL
I found out recently that CentOS is a GREAT "replacement" for Red Hat Enterprise Linux. CentOS is a project of the cAos Foundation, They take the actual Red Hat source code and compile them and maintain them on their own mirrors. The advantage is that they are completely binary compatible with RHEL (in fact it IS RHEL with the RedHat logos removed!) Also, you can use up2date with CentOS to get updates for security, kernel, application, etc. components without having to pay Red Hat for the service. I have "upgraded" an RHEL 3.0 server to CentOS and it worked perfectly! I have also installed "cold" from the CDs and that went very well! I can highly recommend this distro!