Sharepoint STSADM custom extensions...

These are great extensions developped by a MVP (Gary Lapointe) . The whole package and documentation can be found here : https://stsadm.blogspot.com/ 

The list of the 54 (!) new commands can be found here : https://stsadm.blogspot.com/2007/08/stsadm-commands_09.html 

You can for example use this package to copy lists items as described in this post : https://stsadm.blogspot.com/2007/11/import-export-copy-and-delete-lists.html