Google had recently come up with a limited test for their customers who are willing to buy ads via online ad-buying system. Google is already working in US Market with more than 700 radio stations. Further Google says it has that the integration is completed and started with US beta test of Google ads with small group of Adwords advertisers.
The Adwords purchasing system offers its customers to track the amount spent on each radio ads. Google as well invite small set of advertisers to join the current test program. Company is not yet sure on the date which is set for radio advertising service to advertisers. Very soon google will expands his web search advertising across media ranging from newspaper to online.