Wow, I know this question has so many factors that go into the decision, but I need some help. I presently have a 12" iBook 900 and love it, but can't stop drooling over the new powerbooks. I don't mind the 12" screeen, but something larger would obviously be pleasant. I just feel that if I simply get a 12" Powerbook, I am just getting a new case (that's faster). Apple has priced the 15" so close to the 17", that I feel I should just spring for the 17 and call it a day. But look what rationale I just used...I went from a 12 to 15 to 17 in a matter of seconds. I've been doing this for several weeks now, and it's driving me nuts. I do travel a lot (flying, etc) and have a bag that is sufficient for the 17" and my work laptop (Thinkpad). I do have a concern about placing both computers (if I got the 15/17 inchers) in with my Thinkpad. See, once you start putting a lot of items in a backpack (my work bag wears like a backpack) it starts putting stress on the items in it. That said, do you thin, the 15/17" screen is too large to handle weight on it (i.e. would the screen be at significant risk for breaking with a Thinkpad against it)? Just am looking for a reason to get a single model. I know everyone has their opinion, and that is what I am looking for. What do you guys think?