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I've only looked at a couple. One had the code samples as images, which was not so great on my K2 (probably not bad on a DX). Another had the code as simple mono-space text, which was more readable though the lines tended to wrap on the medium font sizes I prefer. However, both were fine using Kindle for PC on my notebook, which is normally all I need most of the time for coding reference books (as opposed to maybe more general books that I'd just want to sit back with and read cover-to-cover).
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