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To migrate a site from one location to another (for example, from http://Fabrikamsites/currentprojects/project1.aspx to http://Fabrikamsites/oldprojects/project1.aspx), you can use the import and export features of Stsadmin.exe. (Stsadmin.exe makes available a subset of the content migration APIs that are available in the Microsoft Windows Server Code Name "Longhorn" Object Model.) When you use Stsadmin.exe to migrate a site, you can also migrate the user and security settings for the site.
You can use Stsadmin.exe to migrate whole sites, but you cannot use it to migrate content that is more granular, such as specific lists, items, users, or template pages (to do this, use the Component Object Model).