Very thoughtful blog post on As Your World Changes about how accommodation of various disabilities can benefit us all.
Curb cuts for wheelchairs also guide blind persons into street crossings and prevent accidents for baby strollers, bicyclists, skateboarders, and inattentive walkers. The “curb cuts” principle is that removing a barrier for persons with disabilities improves the situation for everybody. This hypothesis suggests erasing the line that labels some technologies as assistive and certain practices as accessibility to maximize the benefits for future users of all computer-enabled devices. This paradigm requires a new theory of design that recognizes accessibility flaws as unexplored areas of the design space, potential harbingers of complexity and quality loss, plus opportunities for innovation in architectures and interfaces.