Windows PowerShell(TM) Scripting Guide
Ed Wilson is a well-known scripting expert who delivers popular scripting workshops to Microsoft customers and employees worldwide. He's written several books on Windows scripting, including Windows PowerShell 2.0 Best Practices, Microsoft® Windows PowerShell Step By Step,  and Microsoft VBScript Step by Step. Ed is a senior consultant at Microsoft Corporation and writes Hey, Scripting Guy!, one of the most popular TechNet blogs.