I will be interesting in your thoughts on the netbook. We almost pulled the trigger on one for our last cruise, but didn't. Right now I lug around a 15", it is nice but heavy.
I have a Tamrac Phot backback with a opening to carry my laptop. When going from point a to b it can get heavy, Camera batteries, lenes, filters, laptop, power supply, and it the top section, my cpap powersupply, exra cords, and meds.