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Roberto Ierusalimschy wrote:
- Which format should we use? (pdf, html, ?)

If you use PDF (which has copy protection features), I strongly recommend that you use Tagged PDF (I don't have an official URL handy; google it). Tagged PDF adds structural information to a PDF document to improve accessibility, especially for blind users. In untagged PDF documents (such as those generated by pdflatex last time I checked), each page is basically an arbitrarily ordered collection of graphics primitives; this is very difficult to convert to linear text to be read aloud. Unfortunately, I don't know if any tools other than Acrobat exist to generate Tagged PDF documents. But I thought I'd mention it for your consideration anyway.
Matt Campbell
Lead Programmer
Serotek Corporation
"The Accessibility Anywhere People"