Ads for Adobe PDF
Adobe has just announced a beta (need to be invited) for a service that will place targeted ads within PDF content. The system is set up to deliver relevant ads powered by Yahoo and allows the publisher the ability to block competitors.
This system could be both good and bad.
Allow publishers to make money from content
Offset publishing costs so publications cost less
Start to see full publications being distributed, similar to an e-book.
More ads in our content
Could be abused
Force the idea that *all* information should be wrapped around an ad model
Overall I think it is an unique direction and it will be interesting to see how/if this model is adopted.