Macromedia Flex is the first and most complete solution for accessible Rich Internet Applications. Flex combines the responsiveness and interactivity of desktop applications with the broad reach and ease of distribution of web applications, while still creating an experience that all users find accessible, regardless of disability.
Flex includes 23 accessible components that accelerate application development and create a consistent, usable experience for users with disabilities. Using these components, developers can create Rich Internet Applications quickly and easily while ensuring a high level of accessibility.
The design techniques and developer resources on this site will help you get started creating Macromedia Flex content with accessibility in mind.