Say, you are a freelance photographer, writer of some kind someone who needs a computer to work, then yes it is worth it..
But there is internet everywhere, even the smallest little villages I visited in Mexico, had some shop with a phone and internet.. I have carried a 10.2 MP digital SLR around Europe hitching for two-three months, and it was very worth it.. But a laptop? I have one 2 Gig card and another 1 Gg card and never lacked for photo space.. I could up load 300 MB to my FTP site for my dad to download back in the states in an hour or two just sitting in the local internet cafe, wherever I was... How large of a camera do you actually have? Will you really need more space than that? You can get internet storage space accessible from anywhere very easily.. Sure I couldn't take RAW format photos while travelling because they would have filled up my cards to fast, but I had my resolution set on the highest JPG setting..
So, no I do not think a laptop is worth it. Unless you are planning on doing paid work on it..