Using ajax with either the amazon or google books api is definitely on my roadmap. I don't (yet!) know how to code ajax though. Also - i'm unconvinced about book covers. Most book covers are actually pretty uninteresting so I'm not a big fan of them. Still, I definitely want to make certain things more visual.
I love the idea and with wordpress integration and less work for user, that is great. I'm not a fan of those links though whenever I'm browsing the internet, but they work.
As said before, the domain name is not the greatest. Find something catchy, more unique, that makes sense and people will automatically associate to this type of linking and ads. The front page is really confusing and took me a long time to figure out what you were doing. Everything below the navigation bar is all cluttered. There should definitely be controls for your slideshow presentation.
