Talk radio ads dropped?
Random and purely subjective observation.
At the start of 2010, the talk radio stations here in Spokane suddenly lost most of their advertising. Before that, the mix of real ads and PSAs varied from hour to hour, and (somewhat surprisingly) the Air America station had more real ads than the Rush station... but all had more paid ads than unpaid PSAs most of the time.
After Jan 1, about 90% of the advertising time on all four AM talk stations is unpaid PSAs. If this is a real business decision, not some kind of temporary contract dispute, it doesn't bode well for the continued existence of the talk format here.
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Update 1/15: Seems to have returned to previous levels. Must have been an artifact of year-based contracts or something.