I've almost totally convinced myself to get the 15" Powerbook as this laptop will be my desktop replacement. I am a little worried that the 12" being slightly underpowered may make quite the difference 3 years down the road. I intend to keep this laptop for at least 4 years. Are most of you that buy the 12" buying with the intention to upgrade earlier than every 4 or so years? Am I really going to see that much of a difference between the 1.33 GHz and 1.5 GHz processors 3 years from now? Screen size isn't that big of a deal, for if I go with the 12", I am going to keep my 15" LCD as an external monitor at home. I would save around $500 going with the 12", but I still can't seem to convince myself off of the 15". I am going to Comp USA today to finally see a Powerbook in person for the first time. Hopefully this will help my decision. If anyone has any input, please give me anything.