If you like to support open standards format, here is a (at least for me) new discovery: .epub.
If you like open standards and ebooks, support the spreading of .epub. This file extension is a mixture of three open standards OPS ( Open Publication Structure ), OPF ( Open Packaging Format) and OCF (Open Container Format), produced by the IDPF.
From what I know Kindle – the hot ebook reader of the moment – does not support .
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