Keep it nice in here.
And the screen being the largest battery user on a normal day is only defined within your parameters. My largest users is Pandora over 3G - with the screen *off*.
As I already responded to each point individually earlier, I won't go into them again. I do have one question though:
If your screen is off the majority of the time, my understanding is that auto-brightness is not going to be polling. Is this incorrect? Because if it polls the sensor even when hte screen is off - that is a big problem, and one that needs to be addressed in the Android issues list at Google Code.
Can anyone confirm one way or antoher which is true?