I came across this today via Not Martha. It's a Yarn CSA, the first of its kind (Not Martha is actually giving away a share). Martha's Vineyard Fiber Farm is the source of this CSA, and they raise registered Angora Goats, Cormo, Cotswold and Babydoll Southdown sheep, resulting in wonderful fleece that can be turned into fiber. Here's a little more info from the site:

Our farm is dedicated to producing the finest fleeces, roving and yarn by giving our animals the best possible care. We are deeply committed to raising our goats, sheep on a natural diet of pasture and hay for as much of the year as possible. We’ve also made a conscious decision to have our fleeces processed by a small, family-owned, solar-powered mill rather than sending them to a big commercial processor. We think the extra attention detail we receive is worth the added expense and slightly longer return time. And we like the idea of keeping those dollars in the hands of fellow farmers.