SCOM MP Catalog

Active Directory Integration Script: Enables you to extract a list of computer names from your custom SQL Server database, based on a specified query parameter, and add them to an Active Directory security group. You can assign the members of the security group to a specific Management Server.
Understanding how Active Directory integration feature works in OpsMgr 2007

Operations Manager Cleanup Tool: A command-line utility that enables you to remove all of the components of Operations Manager from a local computer in cases where the typical method through the Add/Remove Programs application in the Control Panel has failed.

A few other useful tools and utilities:
Action Account Tool: A Windows PowerShell script that allows you to set the action account on multiple computers.
Effective Configuration Viewer: A tool that displays the set of rules and monitors that are running on a computer, distributed application, or any other managed entity after any configured overrides have been applied.
AEM Validation: A command line utility that will allow you to perform end-to-end validation of Agent-less Exception Monitoring to verify that AEM is properly configured and operational.

System Center Operations Manager