Until now CopySourceAsHtml only supports Visual Studio 2008 out of the box.
But it is no problem to pimp up the config-file for supporting Visual Studio 2010.
- Copy all three files to "%userprofile%\Documents\Visual Studio 2010\Addins"
- Open CopySourceAsHtml.AddIn in a text editor and change both lines with
<Version>9.0</Version>
to
<Version>10.0</Version> - Run Visual Studio 2010 and CopySourceAsHtml works fine