I have one book, Jerry Coyne's book Why Evolution is True, that only downloads as a pdb. All of the other B&N books that I have (including the samples) download as epubs under the B&N software on XP and Vista, but as pdb from the web. It's not a bad deal for me since I get the epub books (which I prefer), but still have pdb versions I can read on my Centro without going through the trouble of converting them.
I haven't made the leap to Intel yet so I haven't been able to try the most up-to-date Mac version of the B&N software.
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