@Golden Boy: Not sure if you answered your own question there, but in the case of Atlanta, the way you phrased it, it appears as if WSB simulcasted on FM just for the same of being on FM. A similar discussion is taking place in New York with CBS' three AM stations and three FM stations (one, perhaps, two of them, vulnerable). Is it worth cutting off the extra revenue from a music format for a simuclast of an AM station? More food for thought: Consider Clear Channel's cluster of stations in their hometown of San Antonio. On the AM side, you have the blowtorch WOAI and sports KTKR; on FM, four music stations that do well and a station with a bird-fed conservative talk format threatening to not register in the PPM, that's how low their ratings are, though, in all fairness, that station's signal is not very good in the SATX metro. So if CC were to switch that station to a simulcast of one of its FM's, one would argue that the sports station could use it, but there's also the argument that the blowtorch WOAI can also benefit by being on FM for the sole purpose of existing on the band (of course, they couldn't really claim they'd be the first news/talk station on the FM band in SATX). Of course, these discussions can shape in markets great and small.
@Keith: I'd give K-HITS just a little more time.