Warn a user if they add an ebook they've already purchased to the shopping cart.

When generating the various "deal" emails, don't include ebooks the recipient already owns. I own over 150 ebooks from various publishers, it would be very helpful for prolific readers and collectors of reference material such as myself. On a related note, it would be nice if the site would warn a user if they add a book they already own to the shopping cart. I can't keep the titles or even mental images of all the covers for books in my expanding library. It's getting harder and harder to avoid duplication. I don't expect O'Reilly to warn me about books I purchased through Amazon.com unless it was an O'Reilly book that I registered.
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