The US Supreme Court starts its next term next week. The SCOTUSBlog is from the firm of Goldstein & Howe, P.C., and started on October 1st. It looks like a very promising source of information regarding the actions of the United States Supreme Court.
I found a link to the site from this thread on Metafilter, in which Sam Heldman gives his thoughts on the upcoming term of the Court. His blog, Ignatz, also contains some great insights to the workings of the Court. His predictions about how the Court may rule on certain cases is worth checking out.