Google, having recently ventured into print advertising, is considering yet another way to extend its advertising program, this time to TV, according to the New York Post (via MediaBuyerPlanner). TV would likely be a tough nut for Google to crack, as network executives have been successful in resisting all efforts to resell their ad time, and network executives - as well as media buyers - reject the idea that "buying a TV spot can be reduced to a computer-run auction," the Post writes.

Enron once tried to create a marketplace for trading TV advertising in 2001, but after the venture was dissolved, employees said that the company had been able to make some deals in the cable spot market but had no luck attracting major networks or media firms.

Media executives said that Google could perhaps make a start with niche cable channels that desperately need ad dollars, but that it's pretty hard to imagine most sellers' being willing to put their inventory in someone else's hands.