Just for grins I installed Sony's ebook software (since the newest version supports Vista 64) and gave the free book library a try. I used Calibre to convert an epub to mobi and sent it off to my Kindle, and it displayed well enough.
As far as I can tell these books are already available through google books. So, the content is nothing new, but being able to get them more conveniently definitely is.
Edit: The second book I tried was utterly unreadable. I can't speak for how it looks on an actual Sony though.
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