Battery life for music was around 18 hours, falling a bit short of the 24 hours published by Apple. This also included leaving the phone on and taking a few calls throughout the day, as well as having e-mail set to check every 15 minutes, with 8 of the 18 hours on EDGE and the other 10 hours on WiFi.
In the more practical realm of battery tests, I found that heavy daily usage (an hour of phone calls, e-mail checked every 15 minutes over EDGE and moderate internet browsing) would drain the battery over the course of the day to below 20%, requiring a recharge at night.
However, on a day of light usage (10 minutes of phone calls, email every 15 minutes over EDGE and about 30 minutes of web browsing) I could almost stretch two full days out of the phone's battery. I would charge it overnight, use it during the day, leave it on overnight, use it again the next day and charge it when I got home from work (a total of 35 hours). This includes very little Internet access and no video, YouTube or otherwise.
The importance of talking about how often the phone needs a recharge is related to the number of battery cycles the battery goes through before it is no longer holds a charge for a long time. If you recharge your phone every night, that's 365 cycles per year, and if the battery only lasts 400 cycles, that's 13 months of usage before you have to replace the non-user replaceable battery. And given Apple's $85 charge for battery replacement, plus a $29 loaner fee for an iPhone to use while yours is in the shop, it could be a very big issue in a year.
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