I build quite a few virtual machines and usually I set them up as a domain controller so I can enjoy the wonderous use of AD (Active Directory). This was a problem for my latest one which was going to have TFS (Team Foundation Server) installed.
TFS on Domain Controller
Getting to the point...What I needed to do was create local users to set as my SQL/TFS/WSS service users and I didn't want them to be displayed to me on my Welcome screen as valid users who could login to the box. A little OCD on my part. So I did some searching and ran across this little gem. Thanks to How-To-Geek for the tutorial.
Remove Account from Welcome
Works perfectly on Windows Server 2K8. Give it a shot. I guarantee you will love it.