Found it! It's another Sourceforge project called VB.Doc. It's targeted at
the 1.1 framework, but if you miss out the UI project, it will compile for
1.0 without any problem. It comes with a NAnt task to invoke it, but it's
targeted at 0.84, so I've re-compiled it against the nightly build to use
VBCommenter is a VS.NET plug-in right? Perhaps you could write a custom
task that used the VBCommenter interface directly to do the work. I
don't know how difficult this would be but it seems like a possible
option. Of course, if another utility already does this then you should
use that instead! :