Noticed this morning just how much larger the 15" MPB is than my previous 13" white laptop. My new one barely squeezes into my timbuk2 messenger bag. I’m digging the larger display for photo editing but think the 13" is more practical for day to day work. The 15" is not quite big enough to do two windows side by side (e.g. firefox and textmate for developing) so I still end up tabbing through applications.