I found an interesting article over that Paul's Windows Supersite that outlines the different flavors of windows 2003 Server Operating System. It outlines the have's and the have nots in a side by side chart outline. Some of you may be interested in say the differnece between the standard and enterprise editions of Win2k3, I was and this laid it out as simply as it could possibly be done.

It is very informative and I think you'll find it useful as well.

Have a look