What specifically are you looking for? There are ALDs, closed captioning, reflective captioning, a handheld PDA and interpreters for certain shows.
First do you understand sign language? If so there are interpreters scheduled for certain shows and rides on a rotating basis. MK - Mon and Thur, EPCOT - Tue and Fri, Animal Kingdom - Sat and MGM - Sun and Wed. Interpreters can also be set up for backstage tours, special events, and dinner theater such as Hoop Dee Doo Revue and the Luau.
ALDs, clicker for CC and the handheld PDA that scrolls the script on certain rides (also does the cc) can be obtained for Guests Services at each of the parks. PDA not available at AK as yet. You need to leave a deposit in cash or on a credit card which is returned when you return the device that day.
Reflective Captioning can be requested at the venue from the first castmember you encounter before going in.
A schedule of times for interpreted shows and a list of venues that have RE and CC can be obtained by contacting
Mark Jones He is also the person to contact if you need interpreters for other things on park. He needs at least 2 weeks lead time.
If you have any other questions feel free to ask