welcome to the forum ! i also noticed your free ebooks although i haven't downloaded any yet. it's always great to see another source for ebooks.
i'm sure you'll find a lot of people all too happy to answer questions here and help you out with anything you need. i see you have some excellent info in this thread already, and in fact i second it all. the point about the covers is well-made ; they are important even on an ebook, and we appreciate them a lot. some of us like to browse our ebook libraries in cover view (whether on the pc or a dedicated device) and it's rather sad when there isn't one. in fact, when i get a book which has no cover, i often make one myself, if only with a photo, just to have something nice to look at. ebooks are very convenient but they should be *nice* books too.
see you around the forum ! please feel free to ask all your questions.