I'm trying to squeeze more life out of my MBP, which has lead me to wondering about what hardware set up would maximise battery life. A couple thoughts: 1) Install SSD - are they really the best way to go for on and off usage, or are the green spinning drives better? Also, would having a relatively full hard drive decrease battery life? 2) Remove optical disk drive - does this use any power in standby? 3) Use a single stick of RAM - would this matter at all? 4) Underclock the CPU I think that's going too far! Especially on a mac, but if it were a windows machine I'd probably consider it!