Well, I bought a 12" PB two weeks ago, and i love it. this is my fourth Apple. (IIc->PM6100/60->PB5300c->PB867Mhz.) I've read a little on the apple website about proper battery maintenance, but i'm wondering if there's more i can do. Yes, I've already calibrated the battery by charging it, then completely draining it. Should I leave it plugged in, or will this negatively affect the battery? Or should only plug it in when it needs to be charged, and then unplug it until it dies? Thanks for the input. Cheers!