esseb, i've just noticed this is your first post here ! i'm quite honoured you've chosen to use it for my book.
and i'd therefore like to add to my previous comment a big "welcome !" to mobileread. you'll find quite a few gorgeous epub books here, take a look specifically at any book made by jellby.
and please join in the discussions about epub in the epub forum. you might also be interested in sigil, a dedicated epub editor developped by a very talented mr member valloric ; it has its own dedicated forum.