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Well, firstly, the name. What is cool and hip about Kindle? Nothing. So it is unlikely to do very much outside a devoted group of users for whom hip and cool isn't a consideration.
Then the technology. It's already possible to download e-books to iPod, so I doubt there will be many conversions for that functionality, and the iPod just does so much more.
I have music (over 6500 tracks), films (all my favourites) , tv shows, podcasts, games, my entire photo collection and so far, two e-books. All that and the thing is still only just about half full.
The Kindle scores on one item only as far as I can see, the battery life; one month is astonishing.
