I would like to gently point out another option that I have been involved with for converting PDFs to ePub. The primary solution comes as an Acrobat plugin which uses similar conversion algo as PDF to RTF/ HTML options.
The solution also has a free web based option available at
http://www.pdf2epub.com/trial . While the software is still a work in progress, it is simple to use and most of the font level formatting options are retained in the converted ePub. I would love to hear feedback from the community.