I'm a little annoyed by the fact that my Air won't "remember" the brightness I set for the screen. This is especially important for running on battery power, and in general for the longevity of the panel. I jump into work and forget to bump it down. Without fail it always reverts to 100% brightness by default. What's up with that? I do shut down from time to time to preserve standby power and occasionally plug in an external monitor...would this be "erasing" my brightness settings? Just sleeping and waking doesn't seem to have an impact.