Red Hat Distro Code-Naming Scheme?

mozart in mirrorshades asks: "Okay, I know that there is a naming convention that is used by RedHat for the distro code-names. I asked some Redhat guys at the Atlanta Linux Showcase (hey Rob!) how the names were linked and they refused to tell me. Apparently there's a link between each pair of names (eg: Cartman(RH6.1) and Lorax(RH6.2?) are both cartoon characters?). Could someone please shed some light on this so I can put an end to my quest?"