Just a quick little post today: I got the error “The Path ‘path’ is already mapped in workspace ‘workspace'” when I connected to a new Team Foundation Server and tried to map my workspace today. I had connected to a Team Foundation Services project a while back to get some shared code, but I already removed the workspace and the server binding. Even though Visual Studio didn’t see any other bindings, mapping my workspace to the same folder the previous TFS binding was mapped to served me this error.
The quick solution: manually edit (or remove if you don’t have any other bindings) the file VersionControl.config, which can be found under %AppData%LocalMicrosoftTeam Foundation4.0Cache
Hope this helps.