Hi, I know there's an old saying, "Better to remain silent and let people suspect the worst about you, than to open your mouth and to remove all doubt." Or something like that. Anyway, I'm putting my foot in my mouth on this one... I see that the 17" A|PB is going to be bigger than the 15" TiBook, but is there really such a big difference in performance? I know that it now has Airport Extreme and Firewire 800, but given (what appears to be) a much larger shell, couldn't the nice people at Apple put a little more in it? (i.e. a slot for a second battery, more HDD?) I'm not a big techie but I'm trying to understand this. I would appreciate anyone who might have an inside track on this new PB to please share their POV. Thanks!