Its platform will also allow advertisers to tweak mobile ad campaigns on-the-fly to improve campaign results. JumpTap's network spans 400 premium sites and reaches a monthly audience of 55 million unique visitors. JumpTap has also teamed with Medialets on its new rich media ad platform for mobile apps as well as the mobile Web. The new service will initially support ads on the iPhone, with the iPad and Android to follow. --Mark Walsh