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Regarding switching devices: The books sold at kobobooks.com are epubs, nearly always with ADE DRM - that seems to be the most widespread system, and isn't proprietary. Sony uses the same, as well as Overdrive (which provides ebooks to libraries in the US).
I can read books bought at Kobo on my Sony Reader, for instance.
I had a Hanvon 610 for a short while, which did not come with any management software, you just dragged and dropped files. On the other hand, it was quite slow when I tried to look at PDFs with images... I think the instruction manual that came with it took 4 seconds for a page change.
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