Advertising.com found that banners remain the online advertising form of choice, but rich media is hard on its heels. Five out of six sites support banners, and about seven out of ten support some form or rich media, even if it just be the showing of Flash animations that look an awful lot like animated graphic banners. eMarketer anticipates revenues put behind these ad formats will grow at different rates, allowing rich media to catch up a bit. The research firm predicts banners will grow from six to 20 percent per year in the next four years, while rich media will grow from 22 to 35 percent.