PDF is a format with merit, albeit for file size (too large). A format largely used in the technical industry to disperse manuals, articles and other technical information to co-workers and clients. For personal portable use, .pdf is not (imho) the best format. I prefer .lit, but I now have a PRS-505 and suspect .lrf to soon dominate my collection. Till a better solution arrives, I suspect most people wil have multiple formats for various uses.
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