Good post Gato Azul, some minor comments:
Originally Posted by Gato Azul
Redhat Enterprise Linux (RHEL) 4 is Redhat's commercial offering that's generally targeted toward the server market, though is also often used on Corporate desktops.
Red Hat Enterprise Linux Workstation is clearly geared towards professional desktop and development use. Red Hat is pushing new technologies in this area too (for instance, the Java toolchain, Systemtap, and Frysk).
but apart from that they're the exact same thing that you'd get if you spent the $349-$2499 on the Redhat subscription (minus the official Redhat support and Redhat Network of course).
Subscriptions actually start at $179 for a RHEL Workstation subscription. A pretty fair price IMO, what many people used to spend on two Red Hat or SUSE boxes a year. And the price competes well with Windows offerings. Of course, it should be said that subscribers are primarily paying for a service.
CentOS is indeed a good place to start if you want to test the waters