Loaded the great addin for VS.Net 2003, CopySourceAsHtml , version 1.2.3, last night. However, when I went to select some code to Copy As HTML I would get an interop exception. Unfortunately, I did not copy the exception message in the dialog box that was displayed.
Anyway, the solution was to take the source code and do a local build, creating the install file and installing from that .msi file. Then all worked swimmingly.