Well, if the number of pics is no option - - -
At MK - the obvious are the castle ( both day and night shots ), the fireworks, the parades, the Mickey Head at the entrance of the park. Also, there are bronze statues throughout Main Street ( beginnning and end ). Inside the Kodak shop on Main Street at the front of the park, in the back hallway, they have some cool cut outs that you can pose with. If you want just the basics, stick with the Kodak Photospots.
At Epcot - aside from Spaceship Earth, I like to have my pic taken at each land. So many good spots!
At MGM - the hat and Star Tours have some great shots. You can also get some great photos at Indy's Stunt Show. Be sure to visit the 'alley' between the stadium and the Indy shop for some fun shops.
At AK - tree of life, Camp Minnie and Mickey, DeVine, EE, all the animals. TONS of photo ops here.
And of course, any place a Disney photographer may be. There's usually some great shots there too.