PG will take any open format, although they prefer to have an additional ASCII version for those people who cannot read anything else. HTML, XML (with the TEI-lite schema), PDF, LaTeX, etc., have all been used in the past.
For example, we've just started a project on the Distributed Proofreading system to digitize all the maths texts from Cornell's Historical
Math Monographs site into LaTeX. Proofreading a specialised text takes longer than a 'normal' text, but it does move through the site slowly :).
If you don't want to have the hassle of managing the upload to the site yourself, I can give you addresses where you can post a CD that you've burnt the page images on to. 300DPI black-and-white is fine -- that's what most people use. It's a win for you, and a win for me. You get perfect text to go underneath the page images, and we get more books into PG.
If you really can't be bothered, than I understand -- but if you can't be bothered, that means that someone else will have to be bothered in the future in order to preserve that text for the world.
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