Resources:

Please add as you come across.

Williamson Farms in Washington has a beef CSA.

Thundering Hooves, also in the Seattle area, is apparently working to get a CSA going. They raise grassfed beef, lamb, turkey, chicken, goat, and pork. Seems they plan to offer customizable "boxes."

http://www.blackberryridgellc.com/ in Wisconsin is doing a beef CSA

Some very interesting general-CSA resources here, with links and brief summaries.

Miscellaneous:

Benefits of grassfed: Jo Robinson's EatWild site has lots of nutrition info about pasture-raised animals.