I have never taken my PowerBook out of the house but I think that the time has come for her to venture outside. I will need to work on it at a friends house and take it to a few places. I plan to buy a good case from mac-case.com (since I like my mac-case sleeve so much) Not sure if this is a silly question or not but - if I need to leave my PowerBook in the car (it will be in the sleeve + the case) or trunk for a few hours while shopping or driving, if it gets very hot or cold outside can that damage it? What if gets jostled a little bit during the car ride? I am a bit nervous because I use my PowerBook as my main computer. All opinions are very much appreciated! Thanks.