Laptop for me is indespensable for digital pics.
If you have a moderately high resolution camera (4 megapixel and up) you can go through memory in a hurry. I average 150+ pics a day on vacations at that resolution (many get deleted later), but I only have a 256 MB card for my camera.
So If I don't download, that's equivalent to running out of film (with no way to buy more). The least expensive 256 MB Secure Digital memory for my camera that I can find is about $60 a card, so to buy enough extra memory cards to cover a 7-day vacation is price prohibitive.
+ I can burn CD's of my pictures, and those of other family members sailing with us (including friends we meet).
Besides that, If I plan to watch DVD movies (if I feel like it) or listen to "my" music I can.