iOS rocks... I'm on 5.0.1 on a 4S, no battery issues. iOS 5 even ran okay on my 3GS.
@ikkaku, mine is set to vibe and beep when receiving new mail, but I turned off notices on the lock screen. Could this be your setup too? Also I downloaded the new Gmail app and was getting vibes and beeps but didnt see any new notices/badges, in the end the gmail app was the culprit, I uninstalled and it went back to normal.
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