Amazon has excitedly started shipping their ad-support Kindles a week early–which raises the question of who is going to advertise on the device. Given what we’ve been told about the pitch, it probably won’t be publishers, even though Amazon doesn’t include “literary references” among the categories of ads that users can designate as preferred, and you can see how a Kindle would be a good place to advertise books. But not at the premium prices Amazon is looking for. According to the company’s rate sheet, they are charging $45,000 a day for ads that share the screen savers with up […]