Product placements on cable fell 20% in the 1st half of ’08 while broadcast placements were up nearly 12%, according to Nielsen. Included in the cable data are A&E, Bravo, HGTV, MTV and TLC, with TLC’s "American Chopper" ranked as the top cable show for product placements (27K) from Jan-Jun. Bravo’s "Project Runway" was a distant 2nd with 10K placements. Cable’s top 10 placement series tallied 85K for the period, broadcast’s 9K. [More details at www.cablefaxcontentbusiness.com]www.cablefaxcontentbusiness.com]— Pepsi‘s the charter advertiser within MTVN‘s "Tribes," a series of demographic-focused vertical ad networks built around the company’s core online properties. The cola giant is specifically involved with MTV, and Tribes from CMT, Spike and VH1 are also set to launch this month, with Comedy Central‘s slated for 1Q.