salut florence et bienvenue !
as cassidy said, we have a very nice french forum as well with a lot of great information, including a very helpful list of sites to find ebooks in french. i also am really frustrated by the publishers taking so long to get on the ebook train ; i suggest that you write a polite email to the publisher, whenever you discover a book that you would like to buy is not available in digital form. i do this. it might not have any immediate effect, but hopefully the publishers will eventually understand that we want ebooks !! they can't ignore us forever...
enjoy your cybook and don't hesitate to ask any questions. there are some very helpful people around here.
i see you're in montreuil ; for info, we are planning a second mr apéro at the end of october ! a great time to discuss and show our liseuses over a drink. keep an eye on the forum, it will be announced here.