I just looked at KTBZ's most played songs on Yes.com -- I was wrong, they do play the new Jack Johnson, Radiohead, and even Spoon. I guess I should tune in every now and then (for the past two years, I've only listened to music on my iPod and satellite). Still, the rest of the playlist assumes that I only want guitar-heavy rock music, including a lot of it from the 90's. What I want, and most people I know, is a station that plays the artists I mentioned along with "alternative" music (and I'm not talking KTRU, very left-of-center alternative, either).
Ten years ago, KTBZ would mix alt/rock with alt/pop (ex: Barenaked Ladies), electronic (ex: New Order), adult-leaning alternative (ex: Cowboy Junkies, Mazzy Star). You don't get that variety anymore, which is why I tuned out.