Amazon: another company who was happy with interoperability as long as they didn't have their own proprietary format. *sigh*
You know, these days, when I'm looking for books online, I'm beginning to favor non-Amazon sellers. Fictionwise for ebooks, Abebooks for used books, Lulu for POD, etc. Recently I happily discovered
The Book Depository, a UK based seller of new books at very good prices.
Too much economic weight in a single basket: not a good thing, ultimately.