This is just in. Some recent research indicated that men remember less information when viewing sexually provocatively dressed television anchorettes than if they were viewing more professionally dressed female anchors. Women, on the other hand, are unaffected by the provocativeness of the anchor person's dress.
It would seem to me that, if the goal is to disseminate information, then there would be more over all success if homely anchorettes were used. However, if ratings are the motivators, then go with the hot chicks! Remember Mélissa Theuriau?
Just as an aside: Do lesbians remember less news content while viewing sexually attractive anchorettes? They should do research on this.
Grabe, M. E. & Samson, L. (forthcoming). Sexual cues emanating from the anchorette chair: Implications for perceived professionalism, fitness for beat, and memory for news. Communication Research