I'm sure some one will have a link.
But I just wanted to mention if you have a Disney Visa there is a special character meet at Epcot. It is from 1:30-4:30 in Innoventions West. The characters are in a curtained room, so it's a surprise which ones you will meet (either two or three, we've had various combinations of Mickey, Minnie, Pluto, and Goofy). The photographer will take pictures and you get a free 5x7. You can go every day of your trip that you're in Epcot at those times.
My kids are not big fans of meeting characters out in the parks, but love this character meet.
My sister just went with her daughter (2.5) and they were really interested in meeting characters. They scheduled many character meals so they could eat and meet several characters at the same time rather than waiting in lines throughout the parks.