WebAIM: Section 508 Checklist
WebAIM: Section 508 Checklist Document with tables to use as a checklist for 508 compliance.
Image Alt Tag Tips for AccessAbility (ADA Compliance)
Section 508 of the Rehabilitation Act: Checklist with pass/fail descriptions.
Accessible Technology Initiative (ATI)
Creating Accessible Images Creating Effective Alternative (alt)Text
Making Multimedia Section 508 Compliant and Accessible
Learn About Section 508 Requirements and Responsibilities | Section508.gov
HHS 508 Leaderboard Report