Found a great little tool which I think may be new in VS/TFS 2012 (it was possible in previous versions but seemed much harder to setup)
C:\Program Files (x86)\Microsoft Visual Studio 11.0\Team Tools\Dynamic Code Coverage Tools\CodeCoverage.exe collect /iis /output:c:\outputfile.coverage
It will restart IIS and record a coverage file which can be later opened in visual studio. Great to set going when testers are doing any manual testing in a development environment
