Consider this just another round -- of many -- in the battle between publishers and retailers over the future of e-book sales. As we've noted before, publishers are worried about preserving profit margins, and shudder at e-books prices under $10. They're more comfortable with the Apple iPad model, which would give publishers more control and set higher e-book prices. Amazon, meanwhile, is trying to maintain its dominance in e-commerce against challengers such as Walmart and Target. Billions of dollars are at stake, so the battle is likely to be long and bloody. And hopefully, the interests of consumers won't get lost in the fog of war.