Borrell Associates predicts, via ClickZ, that online radio ads will grow by about 56 percent per year for the next five years, growing from its current miniscule share of less than one half of a percent of current online advertising to an amount that will actually take a toll on traditional radio markets. Currently about $35 million is spent on streaming ads and banner ads on radio sites. If Borrell proves correct, that sum would amount to $323 million in 2009.