o'reilly has started to publish ebooks in multi-format, drm-free bundles at reasonable prices. so far only a small number are available since they are looking for ways to resolve problems of how to display some formatting like monospace fonts (code) and complex tables in ebook format, however they will progressively make more and more available. i suggest you definitely keep and eye on them and check back from time to time (or perhaps they have a newsletter you can sign up for) since they are a very well respected publishing house for such subjects and have an excellent approach to ebooks as well.
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