One thing I noticed about e-mails is that even though I have it set to get emails every hour, it seems that it's alerting me to them like 5 minutes after I get them. That could be draining the battery. I recently just got to 21 hours 55 minutes standby and 4 hours 41 minutes of usage before hitting 20%. That seems a lot better to me than what I was getting. The 4 hours 41 minutes usage was a mix of music, web browsing on 3G, like a 3 minute video on YouTube on 3G and text messaging. I think like two 5 minute phone calls in there too.