I have it done some months ago:

I realized that by introducint a special URL in the sitemap which aggegates
the files and then applies a special stylesheet for generating valid document-v11

I explained that on March: http://marc.theaimsgroup.com/?l=forrest-dev&m=104679326915703&w=2


> -----Ursprüngliche Nachricht-----
> Von: Schlierf, Stephan [mailto:Stephan.Schlierf@VSA.de]
> Gesendet am: Mittwoch, 4. Juni 2003 13:54
> An: 'Forrest'
> Betreff: Whole-site pdf
> Hello,
> a few days ago Jeff mentioned in an email that he developed a
> way to merge
> several files into one pdf-file. As far as I remember this topic was
> discussed here already in the past.
> Now my question is:
> How is this planned to work ? Does it generate a pdf-file for
> the whole site
> or just for the files that are linked to the current
> (visible) file ? For
> me, I'd prefer the last mentioned behaviour; I think it allows more
> flexibility in controlling the process.
> And, last but not least, when will it be available ?
> Stephan