My favorite formats are rhythmic and rhythmic top 40 (or dance if available), but there was a time not so long ago when I really loved urban too, and have caught some "odd" stuff on urban radio. For example, I remember back when Hot 107.9 used to play Britney's "I'm a slave for you" and I remember a little over a year ago hearing "take you there" by Sean Kingston on Hot 107.9. I saw "closer" by Ne-yo on V-103's playlist a while back for a short time, and heard "genie in a bottle" while connecting flights with my walkman on V-103.
It's usually difficult to catch Hot 107.9 or V-103 playing "odd" stuff, but I know Hot 97 in New York does it for a fact now, even though it's not frequent.
By the way, I do think two hip hop stations can survive in certain cities. I've lived in places where there are/were two hip hop (one leaning a bit more r&b) and also two top 40's with a rhythmic and a pure r&b channel as well. Then there are those places with two hip hop's and a rhythmic claiming still claiming to be the new #1 for hip hop while adding a bit more pop songs in. Most urban stations don't play pop, but... what would booty bass be classified under? Maybe that's not as relevant today as it was in 1995-1998, but still? Then you have those stations that would play house and bass in mix shows, while there are those that wont even touch dance, but were heavy with the booty bass.
Then we have Power 106 in LA Where Hip Hop Lives... just look at their playlist and consider keep in mind their dance mixshows... which I do appreciate. I guess in reality, slogans don't really matter, but can sway people (especially newcomers who just landed in an airport and turned on a radio) to go and hang out at a certain spot on the dial for a while. I remember going back to Atlanta in Nov. 2001 and listening to 95.5 The Beat as a hit music station. After a while, I began to get the hint that if I wanted true hit music in the sense of genre variety, Q100 was the (new) place to be because 95.5 became rhythmic, playing mainly r&b and hip hop influenced hits. There was once a time where my only choice for "hit" music was Star*94, and I found myself knowing a lot more about alternative and some pop than anything else. 95.5 and Q100 came and saved the day, but AFTER I already moved, which I was pissed about.