Not long ago I mentioned that Mr Stephen Nipper and his colleagues had set up an RSS feed for US Patent and Trademark Office news and announcements ("US and European Patents Info on RSS" 23 Aug 2005). They are now offering a patent litigation alerter service on RSS and by email.
Each item will contain information on claims filed in the previous week with the names of the parties, district court, and case number. As they explain in their post, this is a very useful piece of information. It alerts defendants who are parties to claims that have not yet been served. The fact that a competitor has been sued can also be useful to those who could easily find themselves in the same position.
On a related but different point, I asked Gary Townley of the Patent Office whether there would be any objection to my providing an RSS feed for Patent Office news along the lines of the Rethink(IP) service. I was told that it would be unnecessary because the Patent Office will announce its own feeds very soon.