If your taking digital pictures, there is no reason not to have a laptop with you. Apart from not being able to afford one.
This is the way I see it.
1. The big benefit to digital pictures is that the pictures don't cost you anything to shoot. Yet unfortunately I still see people with the "film" mindset and only taking a single shot here and another there, always trying to wait for that perfect moment to press the shutter release.
FORGET THAT.... use the digital for what it's best at, firing off a series of shots then after it's on your computer THEN you decide what was the right moment for the picture to have been taken.
2. The choice between a laptop and one of those expensive little photo storage devices with a screen is crazy to me. ( no disrespect to those who have bought them though ) My old laptop had way too small a hard drive for me to take it on this trip, so I researched buying an external harddrive ( about $100. ) upgrading the one in it ( same price but with a big headache ), one of those little photo holders ( $400+ ) or a "new" laptop. So I eBay'd for one and got a 15" HP with 1.25 gb of ram and a 60 gb hard drive. It was $600. Sure it's a bit of money, but when I think about how much I dropped on the trip itself... it's all in perspective.
The key here is to not only think of the laptop as something to hold your images on. If that were the case I would agree with the people that said just bring more flash cards.
-I used my laptop for my 5 year old to watch Pocohontas on the plane down and 101 Dalmations on the way back, that alone was worth bringing it.
-I downloaded all the tips and secrets of Disney to it before I left and referenced them the night before we would hit a particular park.
-I was able to "borrow" some nice persons open wireless network to download some mapquest directions when I got lost driving.
-I was able to play some games on it when I had a little down time and didn't feel like watching TV.
-Most importantly I was able to transfer over 15gb of images to it that I took down there.
-My daughter loved looking at the pictures at night, reliving what happened that day...
I use a fairly large camera and bring my photo case as my carryon, the laptop really doesn't amount to much extra to be lugging along in that regard, and added no more than 2 minutes at the TSA screeners in either direction. In fact getting that through the screeners took less time than taking my shoes on and off on the way down.. ( I wore sandels on the way home to avoid that )
I use a 4.1 megapixel camera, but only a few people pointed out the important issues about the megapixels...
First, The megapixel rating on a camera is the MAX it is.
Many people don't bother shooting at the max, others shoot at max and then reduce the size of the image once they get it to the computer.
But many of them are the same people that think it was important to buy a camera that has lots of megapixels instead of something smaller and a lot cheaper.
Different cameras have different ways of to reduce the file size. The first being reduce the megapixels.
BAD CHOICE unless you know the image is only to be emailed to someone or something like that.
The better choice is to use the compression. Most cameras have 4 or so compression options, generally speaking low, medium, fine and No Compression ( in Nikon's case this is called raw ) Without getting into the benefits of each, I suggest using Fine or better in all cases.
The reason why I suggest shooting the largest image size at the least compression is that 99% of the pictures taken in the world aren't perfect when shot. They could use a little rotation, cropping or sometimes even drastic zooming to make them better. If you start off with a medium size image and crop it you end up with a small image. Pretty simple logic, The picture you take in the park is only the foundation how it gets processed is what can make an ordinary shot into a great one. ( keep in mind that those images that are perfect in the first place do not exist in most peoples cameras ) If you ever study photography you will find that what happens in the camera was only half of the battle, the darkroom is where most of the greats were made.
Anyhow, what I am getting at is this.
If your shooting digital, get yourself some sort of storage device ( preferably a laptop so you can do other things with it unlike the photo storage devices ) and shoot lots and lots of pictures at the largest sizes you can.
At 4.1 megapixels shooting in fine compression I get about 400 shots to a 1 gb card.. I carry two 1-gb cards and one 512mb... I never ended up shooting more than the two larger cards can hold but I feel better knowing that I am not going to run out of card space.
Of course this is just my two cents..
Ps. When we went to England @ Epcot we found Tigger in the back of the toy shop ( near the kidcot station ) there was only one other family in line.. so needless to say taking an extra photo or two wasn't going to bother anyone... After spending about 3 minutes playing with my daughter bouncing, poking, hugging and high fiving her, Tigger realized that no one else was coming back there and decided to dance with her for a couple more minutes.. ( the princess dress and birthday pin probably helped ) Those are the moments you go to Disney for so I shot away... I must have taken 80 shots in those couple of minutes... upon looking at them I'm glad I did because only about 8 are really, really good. I bring this up to point out what I said before about not trying to get "the perfect shot" at the park... Eyes close, Smiles sometimes last only momentarily, all too many times the characters block out a lot of the kids from the camera... Shoot first, ask questions later...
Also, those people who say burn the images to cd.... you can't be more correct... computers fail.. viruses happen and you MUST back up your images..
Sorry so long winded... have fun on your trips.