As the new liberal talk-radio network finishes its first week in operation, industry insiders say the most impressive thing about the effort is not its performance — that has gotten mixed-to-negative reviews — but the fact that the network, Air America, has received such extensive press coverage relative to the tiny size of its audience. "It was off the charts in terms of how much ballyhoo and hoopla it generated, considering what it is," says Michael Harrison, the editor and publisher of Talkers magazine, which tracks the talk radio business. "It's a modest startup, and it was treated like some...