You probably came to JimThatcher.com for one of two reasons; either you are looking for some information about accessibility or you are looking for someone to help you with accessibility in your organization. You've come to the right place in either case. Other reasons, then let me hear about them.
For information, there are two main resources here. Check out both the News and Resources sections. The tutorial on Web Accessibility for Section 508 is the most popular landing place on my site. This accessibility course was written for ITTATC (the Information Technology Technical Assistance and Training Center) which was funded by the General Services Administration.