Google announced they have completed their audio ad test and is now in the process of rolling out audio ads to all US advertisers. In fact, I reported on May 15th, that many advertisers began seeing the audio ads option within their AdWords console.
Today, EBay to Broker Radio Ad Time from the Wall Street Journal reports that eBay is getting into the audio ad (radio ad) auctioning business as well. eBay with Bid4Spots Inc. of Encino, California will begin allowing radio stations to auction off air time within the eBay media marketplace. More than 2,300 radio stations are expected to participate.