If you’re thinking of creating an e-book and can’t decide whether to give it away for free or charge for your hard work, you now have a third option. Yahoo and Adobe have teamed up to provide contextually relevant ads for PDF documents.
According to CNET, publishers upload their PDFs to Yahoo (we assume via Yahoo! Publisher) and then text ads appear in a panel to the right of the main PDF content. The ads are dynamic, giving them flexibility to change based on the content.
Here’s a screenshot from CNET: