1) Spotlight is now only accessible via a swipe-down gesture. I get that Apple wants Spotlight to be easily accessible, but what's wrong with letting users use the old swipe-left-in-the-first-home-screen-page gesture instead if they like that gesture? 2) Cover Flow is missing. 3) You can no longer post to Facebook or Twitter via the Notification Center. EDIT: I've got one more. 4) You can no longer delete mail messages simply by swiping them and pressing "Delete."