Rory Perry, Clerk of Court, Supreme Court of Appeals of West Virginia, has published an article entitled Syndication and Weblogs: Publish and Distribute Your Court Information to the Web. The document goes into some detail about how West Virginia has created RSS feeds for Recent Opinions, Civil Topics, Criminal Topics, and Family Topics. He also gives resources for using RSS.
The Utah courts have done a good job of putting together information resources on things like court opinions. There's even an email notification tool. So far, no RSS, but creating it from what they already have wouldn't be difficult.