I travel often in a car and do some overnight stays at hotels while on business. I take my ultra-portable Dell with me and sometimes I will take my 12" PB with me. Now, as the weather gets warmer, I am wondering if I need to be concerned if my PB stays in a car about a few hours in the parking lot (while meeting with clients) during a sunny day (or a very cold day, for that matter) . I keep PB in the incase bag in the back seat when I am driving. If PB is under the sunlights which came in from the car windows (as a car moves, I may not be able to position the PB where no direct sunlights trickle in in the back seat), PB gets warm or cold quickly because of its Al casing, which makes me a little concerned. I am a little wary of keeping it in the truck as it gets warmer more quickly. Also, if you need to walk around with the city with your PB in its bag either in hot day or cold day, the machine gets either very warm or cold. Does it affect the machine adversely? I am trying to find out how the other forum members are treating their PBs while on the go (by walk, car, plane, and etc). Any tip on treating PBs well (without going too much overboard) will be appreciated. Please note my Dell has been going through my brutal daily use by running non stop in my passenger seat wih its wireless card on (to get e-mails in at all times) all day while I am at work on sales and gets the above mentioned treatments almost daily. So far, it is holding up well.