Came across this news recently. It seems that Google are looking into the possibility of checking websites for their accessibiiyt for people who use screen readers – software that enables blind and partialyy sighted computer users to access inter pages.
These software packages, such as Jaws, Hal, Window-Eyes, have spicific things that make web pages accessible. By the way, research has shown that web pages that are accessible to screen readers are also much easier for all website readers.
Anyway more at: Google tests Web search for blind – Yahoo! News UK.