I like the idea of “a book a day”, too.

I looked at the file formats and I strongly suggest .epub, with maybe a epub to mobi converter in the next skylark release. ebup is much smaller, and an open file format.

Just one example to make my point:

ebup is 111 kB
mobi is 496 kB

this is somewhat expected though, epub is packet into zip, mobi seems to be packet into something, too, but I have no idea what.
To make an informed decision one would need to look at a few more things, expecially why mobi is so big in the first place. Maybe someone knows more and can enlighten us.

  • Arne