Okay, I've released 1.7. Changes in this release:
- add a "landscape-half" mode which splits a page into two even halves (gdxf's suggestion)
- if the output document does not have the proper file extension, then append it automatically.
- remove imagemagick and use pngnq for color reduction.
- fix the problems if the PDF has an incorrect TOC referring to an invalid page. Also added option --no-toc to disable TOC generation.
If you are on OS X or Linux, please recheck the installation instructions -- there have been changes since the last release.
EDIT: I'm going away for the weekend (it's a long weekend), so I may not respond quickly for a few days