Keeping your Mac portable's battery properly conditioned is something that most folks don't do (I know I don't, and I'm aware of the fact that I should). NewerTech, masters of all power-related Mac things, have just announced a Battery Charger/Conditioner for MacBooks and MacBook Pros. This $149 product intelligently charges two batteries at once (it charges one, senses it is done, and then starts on the second battery).