Also quite good is Quilty3000 (ex-Mr. Quilty's Widow, and God knows what her name was before that...) on Sundays during the day.
KCMU is the finest radio station I've ever listened to. They have a true mix during the day, and in the evening they have two hour blocks by obsessed djs who spin all one type of music. My least favorite of these is Jazz Theater on Saturdays, but the rest are quite good.