I left the world of postscript today, but now I wonder how to get a 2up pdf that still has the pdfbookmarks. I found pdfnup but this loses the pdfbookmarks. Is there a way to keep them? Previously I used dfips, 2up, ps2pdf.
The Java project PAX might be helpful. It works for hyperlinks, which are PDF annotations and stripped during PDF file manipulation. I don't know if it works for bookmarks too. But i guess the answering robot of Heiko Oberdiek will come up soon after sniffing the hyperref tag! ;-)