OK so I'm going to buy a new MBP but I can't figure out what size. Currently I have a crap netbook at home and a huge 17" Dell laptop at work. The Dell is almost ridiculous, it's almost like hauling a desktop around and it's really too big to use unless you're sitting at a table. My home netbook is great sizewise (wonderful to use on your lap) but terrible in every other sense -- screen real estate is so small that it's hard to do multiple tasks, processor too slow to play hd video, etc. I'll be using this machine for just about everything at home: light photo/video editing, some code development, in addition to of course email and web surfing. I will not be bringing this machine out of the house very often. I was originally looking at the 13" but now I'm starting to lean towards the low end 15" as the extra screen real estate would be great. My question is: how pleasant is it to use a 15" on your lap (as opposed to a desk)? Most of the time when I'm using this machine I'll be sitting on the couch and I really appreciate this aspect of my netbook.