Public.Resource.Org issued a press release today announcing that they will "release a large and free archive of federal case law, including all Courts of Appeals decisions from 1950 to the present and all Supreme Court decisions since 1754. The archive will be public domain and usable by anyone for any purpose." They are able to do this thanks to an agreement they reached with Fastcase, Inc.
Carl Malamud, the founder of Public.Resource.Org is famous for his efforts making the SEC's EDGAR materials available to the general public for free. There is a great story about Malamud and his effort to convince West Publishing Company to allow his organization to digitize West materials at Tim O'Reilly's (of O'Reily computer books) blog.