A $10 billion investment in the rights to March Madness already has started to pay off “handsomely” for Turner Broadcasting just four months later, according to Joey Trotz, Turner’s senior director of strategic ad technology. Turner is pushing the envelope in that deal with both large-screen, righ-media ad units and streaming to the iPad. But bringing big brand dollars to digital media, in his view, and that of other Digital Publishing Summit panelists Mark Zagorski, CEO of eXelate, Celia Wu, senior director of sales development for MSNBC, Henk Van Niekerk, vp of business Development for adap.tv, and moderator Skip Brand, CEO of Martini Media, also will rely on giving video buyers the kind of metrics they’re used to seeing in the offline world.