If you are virtualising its a good idea to disable the login screensaver, this will save on processor cycles wasted drawing the screensaver to save a screen that doesn't exisit. Imagine 10 servers on an ESX host all with the screensaver running this does create an overhead.

To disable do the following:

[Start] [Run] [Regedit]
HKEY_USERS\.DEFAULT\Control Panel\Desktop\ScreenSaveActive
ModifyScreenSaveActive] according to the Value Data listed below:
Value Data: 0 = ScreenSaveActive Disabled / 1 = ScreenSaveActive Enabled
Exit Registry and Reboot

When set to "0" (zero) it will disable the logon screensaver.