Hi all, What kind of experiences do you have letting a Powerbook sleep in your bag while you travel around on foot? Would it be better to turn it off? What if it's a 20-minute walk vs. a 60-minute walk? I'm principally concerned whether or not I should be worried about my Powerbook overheating when it's asleep, packed in a thick neoprene sleeve (Marware Sportfolio), in a messenger bag. Also, might there be any chance of the hard disk spinning while it's asleep? I don't think so, but I know that spinning hard drives generally don't comingle well with bumpy rides. I love my Powie, and I would be devastated if anything ever happened to him. Just trying to keep him safe.