KDHX here in St. Louis. Check it out online: http://kdhx.org/

NPR and KDHX are the only radio stations I listen to. The rest of them are literally unbearable.

edit: I used to really like XM radio a few years ago, but it was a subscription based service. And I haven't really listened to it much in a few years, so I don't know where it's at currently.