Ad industry heavyweights urge the DOJ to fast-track approval of a Microsoft (NASDAQ:MSFT) /...

Ad industry heavyweights urge the DOJ to fast-track approval of a Microsoft (NASDAQ:MSFT) / Yahoo (YHOO) tie-up, saying the potential benefits for advertisers, marketing services agencies, Web site publishers and consumers are "too important to wait for." Meanwhile, Google (NASDAQ:GOOG) has remained surprisingly circumspect, perhaps out of concern for alienating its customers.