I couldn't get my ASUS A8N-VM CSM to work with Windows Server 2008, but I came across a tip on "Microsoft Answers" where someone suggested using the drivers for Windows Vista from ASUS's page.
Thanks to Microsoft's Dreamspark.com, I am running Server 2008 on one of my PCs. Although it works very well, I ran in to an issue when I tried to install the latest updates to Adobe Reader 9.