There must really be a wide range in battery quality. Mine will go a solid 24 hours with lots of surfing, email, and youtube watching. This is with the default smart mode settings except that I'm leaving my data on 24 hours a day as I have to be able to get email in the middle of the night.
BTW, I leave me GPS and bluetooth on always.
Since I've had my phone, there was a 2 day period where I barely touched it except for voice calls and the battery was 50% after 48 hours. We just charged my wife's for the first time since getting it 2 days ago. It went 48 hours with 30% at the end of that period and she's been doing lots of social networking on facebook.
Her GPS has been left on so that I can track the phone with mylookout.com as latitude won't use the GPS unless it's running the foreground.
Her bluetooth has been off, but I'm about to turn it on to pair with the Prius
I'm curious of your battery stats...do you think you can post what they are before your next charge?
There has to be an explaination as to why some people get this kind of battery life and others get 8 hours.
For myself, I was in a very low signal area for one weekend with my DX and I was barely getting a day out of the phone before I had to refill. Now that I'm back in a heavily covered area, my phone is lasting much longer than that, average 48 hours almost. I know for a fact that the phone will pump more juice to its antenna to "reach out" and get the weaker signals, so this may be why people are getting low use times.
My current stats are as such:
21h 19m 25s since unplugged
Display: 62%
Cell standby: 21%
Voice Calls: 12%
Phone idle 7%
Battery left: 50%
Services On: 3G and location (sometimes)
So based on this, I could probably get another 21 hours out of the phone quite easily.
I should mention that the first day I recieved the phone, I let it die completly. As in it turned itself off and wouldn't come back on. Then I charged it back off while it was off and it took about 2 hours to get her up to full again. Repeated again. By doing this method, I think it trains the battery to last a bit longer. Just a theory though.
and my phone lasted a lot longer today than it did yesterday! i have used a bunch of games / apps / mail / txt etc... and got around 8 - 9 hours of constant usage!