The Black Welsh Mountain sheep is the only naturally black wool and has been prized for that quality for hundreds of years.  Still being raised today, it's prized by handspinners and today's podcast talks to one of the very knowledgable breeders of this breed.
Shown here in the photo with a cape made from her sheep's wonderful black wool, Oogie McGuire raises the sheep at her farm Desert Weyr.  She graciously let me interview her about raising this wonderful breed of sheep.