papamike writes:  

I kinda tripped over this resource and thought I'd share it with everyone. Taken from the website:

The HiSoftware "Cynthia Says" portal is a web content accessibility validation solution. It is designed to identify errors in your content related to Section 508 standards and/or the WCAG guidelines. This free tool, meant for educational purposes, is an online test which only validates one page at a time.

Go to Cynthia Says to learn more.
Go to Section 508 to learn more.