Accessible PDF documents

• Facts and opinions about PDF accessibility
  "PDF files on the web are sometimes annoying and very often unnecessary. But when they aren't either of those things, we need to make them accessible for the same reasons we make other web content accessible."
  (Joe Clark, A List Apart)

• PDF accessibility
  "When people talk about "accessible" PDF files, they usually mean "tagged" PDF files, even though there is more to an accessible PDF than tags. PDF tags provide a structured, textual representation of the PDF that is presented to screen readers. They exist for accessibility purposes only and have no visible effect on the PDF file."
  (WebAIM)

• PDF and accessibility
  "The commitment Adobe has made to improving the accessibility of PDFs has been widely recognised by disability groups and accessibility advocates and has directly benefited many users of assistive technologies. The general opinion of the accessibility community world wide however, is that the use of PDFs on websites still presents a significant barrier for people with disabilities, in particular for sight impaired web users who rely on screen reader technology."
  (Roger Hudson, Web Usability)

• Tips and tools: Adobe Acrobat and PDF
  "After HTML, PDF (Portable Document Format) files are probably the most common files on the Web. PDF is usually used when a file needs to appear or print a certain way, regardless of the browser or technology. PDF files can be made accessible to people with disabilities, although usually with more difficulty than with HTML. A key part of this process involves creating tags that make a document more accessible to screen reader users."
  (Johnathan Whiting, National Center on Disability and Access to Education)