I myself was wondering about Beck's future on 1580, as it seems the station has done minimal promotion of his live event from Washington last weekend. It would be a boon for Dennis Miller to be cleared live in the market (currently, he airs on tape delay from 3-6 PM). Then those promos he cut for the station that go, "I'm on in D.C. at a time when you can actually listen!" will really ring true.
(Does anybody recall Dennis' previous radio home in D.C.? Based on the above promo, it makes it sound as if another station did indeed carry it late at night, as a previous poster alluded to.)