PowerShell

http://bable.cybermarshall.com/2009/05/27/ocring-all-of-the-pdf-files-in-a-sharepoint-document-library-using-powershell-and-solid-pdf-tools/

http://mukalian.com/blog/post/2011/04/10/PowerShell-Script-to-Delete-All-Versions-in-a-Document-Library.aspx

http://www.learningsharepoint.com/2010/08/19/check-in-documents-with-powershell-sharepoint-2010/

http://blog.pointbeyond.com/2011/08/24/finding-duplicate-documents-in-sharepoint-using-powershell/