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For technical papers in two-column format, I've thought of just chopping each page into four. (Brute force, judiciously applied. ;-)

If you feel like testing that, I'd appreciate to hear about it.

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There is a program called pdflrf that does this, and it is far from ideal, since most two-column papers have figures that span both columns. Another tool called PaperCrop does this right, but unfortunately only produces images as output; I have not yet figured out how to reliably join them into e-book format. The non-existence of a good tool to solve this problem is quite annoying...

Just to clarify a point, pdflrf also converts docs to images. It crops & chops, then rasterizes and performs a few image manipulation steps to make the image look better on the Sony screen.

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