Yes, at some point I want to greatly improve the login system and offer both direct login but also twitter/google/facebook. Unfortunately it's a little beyond my coding abilities at the moment! Also, as soon as I start storing passwords I need to ensure they're secure and I'm not quite confident enough in my coding abilities for that yet. Still, I'm learning fast so hopefully soon :)
Yes - I'm going to completely change the homepage soon with a much stronger focus on featured/top lists rather than just recent ones. Also, that top books list is pretty rubbish at the moment, I should change it like you say to go to the list with the book on.