Amazon already sent a pretty clear signal that it has grander plans for Kindle than just its own devices when it launched its iPhone app earlier this year, but Jeff Bezos has now made those intentions clearer than ever, and dropped a few hints of things to come. Speaking at a Wired-sponsored conference yesterday, Bezos all but confirmed that Amazon sees Kindle books and Kindle readers as two separate businesses, and he even went so far as to say that "we are going to give the device team competition" by making Kindle books available on "mobile devices and other computing devices, although he obviously didn't specify other e-book readers. Interestingly, Bezos also confirmed that Amazon had considered selling the Kindle with a monthly subscription plan to lower the cost, or require a minimum number of books purchased, but said that he preferred the simplicity of providing one flat up-front cost, which he says has helped account for the Kindle's success.