Copy workspace mappings from one machine to another

From a command prompt:

tf workspace /s:http://tfs:8080 WorkspaceName;DOMAIN\YourUserName

Then the workspace dialog will pop up and they can select all mappings (Ctrl+A) then copy them (Ctrl+C), then edit mappings in their workspaces by pasting the new mappings over the old ones.

source: http://blogs.msdn.com/b/mohamedg/archive/2009/04/13/how-to-copy-workspace-mappings.aspx