It's above my head, but a blog about appellate law practice has looked at how to use RSS and Feed Digest to monitor the legal systems they're interested in. The poster says: FeedDigest [...] also allows for filtering, so, for example, you can filter a Federal Register feed by only the subject you want, or limit a court feed to only certain keywords. So, you no longer have to pay for Westclip.
It appears Westclip is a news search and query tool geared towards the legal industry. I can't imagine it's cheap, so it's great to hear how people in such a niche industry as appellate law can use tools such as RSS and FeedDigest to monitor the information they want.