Here are a couple of resources that we are using here as we work with our accessibility office to design our internal guidelines for faculty and our instructional design group:
http://www.w3.org/WAI/
http://www.section508.gov/index.cfm?FuseAction=Content&ID=12#Web
Gillian McKnight-Tutein, Ed. D.
Director, Innovative Learning Design and Quality
Office of eLearning and Innovation
Cuyahoga Community College
2900 Community College Avenue - MMC 52B
Cleveland, OH 44115
(216) 987-3612