Misha,
I'm impressed with everything the FBReader has. On the Maemo developer list is information about adding fonts to the system, so I will be quite happy when I can install the font that I prefer to read text in.
The formats that people have requested seem all to come from the Palm world, but there's no Plucker Viewer for Windows, for instance, and I think this Palm orientation must leave out a lot of titles. I think MS Reader and Mobipocket formats are ruled out because of their proprietary nature, but you might want to look at eReader.
On a feature checklist of e-book readers, you have many features already checked off: fonts, rotation, place marker, library. I know you're planning bookmarks, which are essential. I think, too, that highlighting and annotation ought to be considered essential features for a complete e-book reader. I hope you will consider adding them.
Thank you,
Roger
Teleread (e-books:
http://teleread.org/blog )
Electric Forest (digital libraries:
http://altheim.com/ef )