So I've had my iPhone 4 since launch... and haven't noticed any significant battery issues for the past month. So last night, as with every night, I turn WiFi and 3G off while I sleep in order to preserve as much battery life as possible. It's been working great for well... a month. Now, IIRC, I believe I was at 6 hours or near that of usage, and 1 day + 17 hours of standby... so 41 hours. At this point I was at 28% battery life as I went to bed. When I woke up, I was at 9%, and my usage had jumped to 16 hours... so it was definitely "in use" all night... what would have done that? Mail, settings, messages, phone, safari, angry birds, camera, ipod, facebook, photos, shift (a game), maps, app store, and jungle style pinball are the apps in my "dock".