Web Accessibility and the Law for businesses

Hi,
I've been doing some research on how Section 508 of the Rehabilitation Act
of 1973 requires Federal agencies to make their electronic and information
technology accessible to people with disabilities.  To what extent do you
believe that the private sector (non-government, non-education) will face
similar legislation?  Can you refer me to any resources / articles on this
subject?
Thanks,
Ethan B. Snyder