When I do a spin-in podcast, I often will review different breeds of sheep, talking about their history, fleeces and the yarn you can spin from them. Episode 37 (posted Sept 12, 2009 and found here or on ITunes as Yarnspinners Tales) reviews two breeds, the Southdown and Polworth sheep.
Here are photos of each of those samples (you should be able to click on the photo to enlarge). First the Southdown:
And this is the Polworth.