Found this via boingboing
What is Google Accessible Search?
Accessible Search is an early Google Labs product designed to identify and prioritize search results that are more easily usable by blind and visually impaired users. Regular Google search helps you find a set of documents that is most relevant to your tasks. Accessible Search goes one step further by helping you find the most accessible pages in that result set.
How does Accessible Search work?
In its current version, Google Accessible Search looks at a number of signals by examining the HTML markup found on a web page. It tends to favor pages that degrade gracefully --- pages with few visual distractions and pages that are likely to render well with images turned off. Google Accessible Search is built on Google Co-op's technology, which improves search results based on specialized interests.
Oklahoma has a great Library for the Blind and Physically Handicapped that could be a lot of service to those who use this Google search product.