PDF Can Comply With Section 508. Now It's Your Move
http://www.planetpdf.com/enterprise/article.asp?ContentID=6119

Johnson, Duff
PlanetPDF
2003

Abstract:

A blind person cannot read from a screen any more than from a printed page. Technologies nonetheless exist that allow blind and other disabled users impressively full-featured access to documents. To be accessible, however, the document contents must be available to these so-called 'assistive' technologies.