The Microsoft SharePoint Administration Toolkit contains functionality to help administer and manage Microsoft Office SharePoint Server 2007 and Windows SharePoint Services version 3.0.
This tool pack is oriented towards helping SharePoint administrators with complex or demanding tasks—and we will have updated releases several times each year. Each release of this kit will include new or improved functionality to make managing SharePoint easier and less time consuming.
This first release contains two very useful tools which are both supported on Windows SharePoint Services 3.0 and Microsoft Office SharePoint Server 2007. The first tool, called "Batch Site Manager", adds new functionality through Central Administration. From the new "Move, Lock, and Delete Site Collections" page on Applications Management you can schedule bulk operations against site collections in the farm—including moving site collections between content databases! The second tool is actually a new command in STSADM called "updatealert". This command will refresh all alert URLs in a specific site collection, which is extremely important should you change the URL of a web application or after an upgrade.
Announcement (Sharepoint Team Blog)
Detailed Whitepaper (MSDN)