The Universal Access capabilities of Mac OS X are enhanced in Tiger to include VoiceOver, a new spoken interface. Designed for those with visual and learning disabilities, it reads aloud the contents of documents such as web pages, Mail messages, and word processing files. As an integrated part of Tiger, Apple is providing a set of programming guidelines so that you will be able to make sure that your application can deliver the best VoiceOver experience.
How hard will it be to develop applications for children with reading disorders? Awesome.