Tip: To get Radio Userland to read a local RSS file, don't use a local file:// URL (they don't work). Store it in the Radio Userland folder (or a subfolder) and use RU to serve it. For example, if the file is saved as appointments.xml in the main Radio Userland folder, subscribe to http://127.0.0.1:5335/appointments.xml with the News Aggregator.
I'm using this feature to throw some things in the News Aggregator that I am scraping off the Web using Java. I'm thinking about throwing my appointments in there too.