@Kovid - thx for that, though if I understand you correctly you are saying to use calibre's existing PDF engine via pdftohtml rather than the poppler stuff via pdfreflow, right?
As IIRC pdftohtml is what this plugin originally used, but we found it to be very, very slow (particularly on graphical pdfs). Whereas using pdfreflow allowed the plugin to scan subsets of only the front few and last few pages.
No chance of the pdfreflow stuff getting fixed?
