All of them? Some of them? A couple specific ones? Some of them are HUGE improvements (Photos, Game Center, Camera, Compass). Some not necessary but still cool (Notes, Settings, Reminders), and then a lot have not even really changed much at all (Music, Video, Maps, Mail, etc). I also like the new retro Newsstand. It fits better with the scheme and does not stick out like a sore thumb like the current one. Passbook for that matter as well. Safari, sure. It is a bit weird. Maybe if they changed the white border a bit. Calendar is kind of weird looking on a non-retina screen.