Accessible Practices, ASTC      

http://www.astc.org/resource/access/index.htm

Center on Information Technology Accommodation 

http://www.itpolicy.gsa.gov/cita

Department of Transportation:  Accessibility

http://www.dot.gov/citizen_services/disability/disability.html

Disability Access Symbols 

http://www.gag.org/resources/das.php 

Smithsonian Accessible Exhibit Design

http://www.si.edu/opa/accessibility/exdesign/start.htm

Texas Association of Museums ADA / Disability resources

http://www.io.com/~tam/Resources/disability.html