I switched from 15" MacBook Pro to 13" MacBook Pro. It is little lighter but the screen is very small. It is good enough for email but not foe anything else. For that I think MacBook Air or even iPad is good enough.
田仲なお美 
bokushi 
坂本祐央子（さかもとゆみこ） 
落語好きプロコーチ 砂村よしお 
さわ 
freetinyimages 
Lupin 
橋本諭弥 
ウチクラ ケンイチ 
神戸のおいさん 
ClockLink