There are few drain sources: apps especially some key lock ones, S2U2 is a good one; Wi-Fi should be disabled 99% of the time; poor signal, ActiveSync needs to be configured on "manually", and you may need to turn phone off too if it's really bad; blue tooth; screen and power settings; bad karma, there is nothing one can do about that, for everything else there is TaskManager to check CPU utilization and abcPowerMeter to check mAh.