ecschwarz
macrumors 65816
My notebook computers always have a sleeve. Padded notebook computer pockets in backpacks are too bulky and hog up space when you don't have a computer in the bag. Plus, my current computer (11" MacBook Air) is decidedly so thin that a computer pocket in regular bags is too big anyhow.
I also wanted to chime in on this - I got a Monoprice sleeve and it looks and feels just about like the Incase ones, but is dirt cheap at $10. I got one for another backpack that I use and also to use by itself and have been quite happy so far:
http://www.monoprice.com/Product?c_id=113&cp_id=11302&cs_id=1084901&p_id=8820&seq=1&format=2