Photopass:
There are photographers in the parks who will take your picture. they are generally set up in front of things like the castle, the "partners" statue, the entrance Mickey floral doohickey...that sort of thing. They are also sometimes with characters at meet&greet spots.
The benefit of having a pic taken by them is that the whole family can be in the picture, instead of just knowing the family photographer was there b/c you can sometimes see their shadow, or just b/c the pictures were taken.
There's a photopass section on stitchkingdom.com, which is a site by a Dis member, bradk, but it's really WDW-centric. The bare bones basics are the same, but pricing is different, locations are different, some of the special "magic" pictures are different. So you can't get too excited about things if you read there, b/c the things might not be there at DLR.
You can have 5x7 prints made for something like 12.95 and just have each individual print you buy. You can now buy a download of chosen pictures for 14.95 each, and that gives you the rights for that picture, to make prints wherever and whenever, and that's nice. Better than having to do stealth copies at Kinko's or wherever.
But the best value is the photopass CD, where you get all the pictures you had taken by photopass photogs on a CD. And the rights to print them for non-business purposes for forever. Nice.
You can buy that CD in the parks, and they usually have a special involving a couple/few 5x7 prints, for 59.95.
Or if you want to edit them by adding little borders (usually specific to the park you're in, the season you're in, etc) or character signatures (at official character spots, when the photographer specifies that the character was there somehow, you can wait and do do that on your computer. Then you can order the CD for 59.95 plus about $6 shipping, and you'll have all the original pictures PLUS each edit you did and saved.
I ended up not ordering the CD this last time, as we only got 2 pictures (but they were GOOD pictures). BUT I edited those pictures into 50, and then I realized that I should make sure that I saved each pic in both 4x6 size and 5x7 size, so then that doubled it all....would have been a ton of pictures on that CD, but still it was only 2 original pictures so I couldn't justify the cost (especially since we're buying our wedding pictures CD at long last, now that it's been 5 years since we bought prints from the photographer and he's finally letting us buy the CD!).
hope that helps a little.