Because my loadout on my first couple of overnight practice trips turned out to be more (heavier) than I expected, I'm actually re-thinking if I even need a laptop/netbook for a 3 week trip. I can do all internet related stuff from an iPhone and carry enough memory cards for my camera so I don't have to offload them to a laptop. For a longer trip I'd probably want a laptop/netbook.

During the practice trips I shot some pictures with the iPhone and emailed them to friends and the pictures were good enough, I updated my journal from the iPhone too, it was totally doable despite the small size. And the ability to take photos and email them instantly is cool. I still shoot pictures with my camera but I will post-process them after the trip.

Adam