I say "jam" and I'm from the U.S. "of A"
Anyway, I was referring to the lack of an external display.
Well, I have an ACD connected to my MB as I find the screen too small when sat at my desk for hours...
Also, I don't think that a laptop offers the best neck positioning for long term computing.
These two reasons prompted me to buy a 20" ACD and I love it. I use my laptop as a laptop when I am being portable... going home (parents), on trains, in uni, that kind of thing... although the iphone makes some functionalities of the MB redundant (why email - text only - on the MB when you can on the iPhone, for example?).