ProfCrash, it is fine that you like Marvin, but this thread really is exclusively about the Kindle app. If you want to start a flame fest over "my reading app is better than your app" then please do so in another thread. Marvin is a good app but it lacks an iPhone version and it lacks syncing capabilities between devices. Also, I've never heard that it can read mobi or KF8 without converting them, so I seriously doubt that it can.