Thanks for the find. I started a thread concerning a similar issue with PDFs. This is what I found related to converting from a PDF.
Programs that allow you to manipulate and extract info from PDF:
File Juicer ($17,
http://echoone.com/filejuicer/)
deskUNPDF ($100,
http://www.docudesk.com/deskUNPDF_product_home.shtml)
PDFpen and PDFpenPro ($50-100,
http://www.smileonmymac.com/index.html)
Program that allows you to join multiple pdfs into single file with Table of Contents:
PDF Lab (free,
http://www.iconus.ch/fabien/products/pleng/pleng.html)
w/r to just getting the PDF into a PRS-505 calibre, for the most part, worked as well as any of these programs
Hope this helps.
jpm