I've taken to putting the pbook to sleep as an alternative to shutting down, when I ferry the computer between office, hotel (I'm a traveling consultant), home, etc. I've calculated this saves me about an hour over the course of the week (starting up ,shutting down, opening & closing apps). So over the course of a year, it should save at least a work weeks worth of time (45hrs). For me its one of the many reasons I really like the powerbook. My windows notebooks could never do this gracefully. In addition, windows works much better if you reboot daily in my experience. Anyway, I'm trying to think of the drawbacks of hardly ever shutting down the powerbook. I know it will probably take its toll on the battery over time. But even if I needed to replace the battery every year or two, it would still be well worth the time and convenience it buys me. Anyother drawbacks anyone can think of? Maybe they're are other parts being worn down that are not so easily replaced. I can't think of anything.