If you're interested in different wool varieties (or milk sheep, or meat sheep): OSU sheep breeds page. There's one there called California Variegated Mutant; I've heard of them before but had forgotten about them. (They're a wool sheep). There is something amusing about a breed of sheep with "Mutant" in their name (I presume the mutation is in the coloration pattern; it's not like they have six legs or anything like that).

There are several Welsh breeds (Welsh Hill Speckled Face) is one that looks like they must share an ancestor with the Kerry Hill.

You can also learn a little about what is believe to be the wild ancestor of domesticated sheep.

For some reason, the old "heritage varieties" (also the "heirloom vegetables") have long been of interest to me; I suppose it's because they're different from what you typically see and they're sort of a link with the past.