Gannett, Hearst, the New York Times Co. and Tribune, in the grand tradition of doomed online-newspaper joint ventures, is creating an ad network, QuadrantOne. The new partners said QuardrantOne will reach more than 50 million monthly visitors through more than 120 papers. But not the New York Times or USA Today, which already have national sales operations. Yahoo launched a similar newspaper consortium last year, to no visible effect. [WSJ]