Ads On Kindle?

Patent 20090171751, granted July 2, 2009 to three Amazon.com employees: ON-DEMAND GENERATING E-BOOK CONTENT WITH ADVERTISING.

A system and a method of incorporating advertisements in on-demand printed content are disclosed. In response to receiving a request from a consumer for on-demand printed content, an advertisement is selected. The selected advertisement is included within the requested content. Thereafter, and further responsive to the request, an on-demand printed copy of the requested content, included the selected advertisement, is printed.

Lovely. But I'm sure they would never actually do such a thing.

(Thanks Kashmarek)