How to convert your Windows Server 2003... to a Workstation!
After that guide, you can then use the standard procedure that we have, for making WinXP unattended: Unattended WinXP guide
Would be a good thing to have listed here - since some people believe that this version of windows is faster/better than WinXP. Moreover, SP1 for Windows Server 2003 is nearing too!
To all of you who might use this great MSFN guide - post your results, and any problems that you may run into, in a new thread here.