There are quite a few programs out there that you will have to have a "corporate" or "enterprise" version to install on a Server OS.
Example: norton antivirus 2004/5 will not install on Windows 2003 Server. They do this so you are forced to buy the Enterprise Edition.
I personally wouldn't run 2003 Server unless you're using specifically for server purposes. Games aren't going to run faster than they would on XP. Come on, it's the same architecture. There are noticable differences between Windows 2000 Server platform and the Windows Server 2003 platform. You aren't going to find a whole lot with the XP vs. 2003.
If however, you have more than one computer on your network, 2003 Server will allow you to setup AD (if you know what to do with it).
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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