I just bought a new powerbook 15" (MY FIRST MAC EVER!) and i'm wondering if anyone can suggest a good bag so i'm able to tote this thing around with me. I am a student so i really need a lot of extra space for my books and such. I've come across a couple of shoulder bags on Apple's website, but it's hard to tell much from a picture. Anyone ever used an STM or Timbuk2 shoulder bag with their laptop? How's the durability, storage capacity, etc. One other question - how well do the Kensington notebook locks work? I'm always away from home with my laptop and have never worried about it being out of my sight while out in public (because it's an old piece of crap Toshiba). With my powerbook i will be much less inclined to just leave it lying around out in public. Any suggestions?