My battery life never seemed to be very good, but it also seemed to get even worse after the 1.1.1 upgrade. I could fully charge the battery overnight, carry the phone with me during the day (mostly on standby, perhaps one or two phone calls, no internet usage) and by mid-afternoon it would start warning me that the battery was almost drained. I called Apple about the problem but they claimed it was not a known issue. I ended up sending in my phone anyway to get repaired (last week) and haven't received it back yet. I'd be curious to know if others are seeing major battery issues since upgrading to 1.1.1.