Actually, another thought on this - Amazon of course is selling the 'current' incarnation of a book. The problem with ISBNDB is that it lists all possible incarnations, and the current one is not neccessarily at the top. I do find with library thing that if I manually put in the ISBN-13 that I find via the amazon search results page that I have better luck with a higher quality cover. If I just randomly pick one of the ISBN's from ISBNdb then I'm more likely to get lowres/no cover.
So in retrospect, without solving the problem of figuring out what the most recently published ISBN is I'm not sure that Amazon would make that much of a difference.
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