Red Hat have been pretty smart with the whole Fedora/RHEL/CentOS progression. You get to mess with cutting edge stuff in Fedora (and Fedora Silverlight), and th

Red Hat have been pretty smart with the whole Fedora/RHEL/CentOS progression. You get to mess with cutting edge stuff in Fedora (and Fedora Silverlight), and then take what works to fold into RHEL. Then you rebuild RHEL into CentOS so people use the free and binary compatible version of your product, which leads them to use the supported/sold version in production.