AdRants reports that 29 percent of traffic to a site created as part of a recent Audi A3 campaign was generated by advertising on the BlogAds network.

The kicker is that 29 percent was achieved with just one half of one percent of the overall media budget. Let's say it again, advertising on weblogs deliver Audi 29 percent of all responding yet took just on half of one percent of the budget to do so. To drive the point home even further, Mickinney-Silver, on its A3 timeline site states, "The media cost for the entire blog ad buy was less than the cost for one banner ad on a mainstream site such as Yahoo!"

I guess I should balance this out with a story about an amazing blog advertising failure. Anybody got one?