Richard Pipe from InfogridPacific announced that their EPUB Reader Azardi which is currently based on Qt platform is being ported to Mozilla platform
So, in the near future there will be two Mozilla based EPUB readers.
It seems to me that now it is time to think about collaboration. It is really worth the effort to have two similar projects? Too many good projects were killed because of unnecessary splitting of efforts.
Azardi project is opensource; EPUBReader project is just freeware. I don't know the reasoning behind current license of EPUBReader, but it seems to me that going open source and joining the efforts with InfogridPacific to develop one feature rich EPUB reader software based on Mozilla platform would be the best way for both projects.