MSBuild task for extracting coverage XML from MSTest runs. Outputs a
serialized DataSet; you will probably need to run an XSL transform to get it
into a useful format (see MSTestCoverageToEmma.xsl).
Based off http://archive.msdn.microsoft.com/vscoveragetoxmltask and http://wiki.hudson-ci.org/display/HUDSON/MSTest+Coverage+Reports, just updated for VS2010.
See Example.msbuild for usage.