Microsoft has ’opened up’ a cool new section on their TechNet web site dealing with scripts, scripts, and... that’s right: scripts.
This Script Center categorizes the best sample scripts designed to run on Windows 2000, Windows XP, and Windows .NET Server.

Some other sites also provide very good material, such as:

• http://cwashington.netreach.net (Very Good)
• yhttp://www.netal.com

And should you happen to be looking for a script editor, check out Primal Script, one awesome tool!