In reference to your E-Reader / Tablet issue, I had the same problem a few weeks ago and found the answer (or at least the idea for it) on wikipedia. Granted, an HTML version would be best, but if possible, a simple compilation to a second file type would save you hours of eye strain and problems. If your viewers are capable, a two file system may be best. Specifically for tablets, it turns out that the specifications for the Supreme Court briefs are just about perfect for viewing on a tablet. From Wikipedia ( http://en.wikibooks.org/wiki/LaTeX/Page_Layout )
Those who want to read on tablets or other handheld digital devices
need to create documents without the extra whitespace. In order to
create PDF documents with optimal handheld viewing, not only must the
text field and margins be adjusted, so must the page size. If you are
looking for a sensible dimension, consider following the paper size
used by the Supreme Court of the United States, 441pt by 666pt (or
6.125 inches by 9.25 inches), which looks great on tablets. You could also use the Supreme Court's text field size of 297 pt by 513 pt, but
this is too wide for fonts other than Century Schoolbook, the font
required by the Supreme Court.
Here was my implementation of it. It is rather bullish and perhaps someone has a better working, but it works perfect for tablet viewing :)
% Adjust The page size via use of the geometry package
\usepackage[paperwidth=441pt, paperheight=666pt,
textwidth=297pt,textheight=513pt]{geometry}
% Use the New Century SchoolBook font and fourier math
\usepackage{fouriernc}
Note you can use any font you want, but with a high x-height
and excellent readability on both tablet and print, this is an
excellent choice. If it is truly to be a "tablet" viewing document, maybe even a sans font may be the ticket as they have better readability on low-res screens as well.
Best Answer
Ross Moore talked about tagged pdf at TUG 2010:
http://river-valley.zeeba.tv/tex-mathml-for-tagged-pdf-the-next-frontier-in-mathematical-typesetting/
He mentioned that he uses an "extension" of pdfTeX, but I don't know the details. There would certainly need to be a lot of work done to transform the structure of a LaTeX document into a form that a re-flowable PDF viewer could take advantage of.