The problem I have with Mobipocket becoming a ubiquitous format is that I highly doubt that it will, in the long run. It has several technical shortcomings that I have detailed in other threads. Amazon itself has created a new ebook format (Topaz) to address some of these shortcomings (notably embedded fonts, and probably also the really weak DRM).
In fact, if I were advising someone on an ebook format to use for archival purposes I would strongly urge against Mobipocket. In the world of digital information, ubiquity at a certain time is no guarantee of future longevity, format shifting is simply too easy.
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