FeedTheMe is cool
BETA = VERY YES FeedTheMe lets users register their own feeds that are then aggregated into a single feed within the course.
If you want to add FeedTheMe to your course you'll need to login using your Twitters to get a key and shared secret to use in your course. Copy this XML link and pick "By URL" as the configuration type to quickly set it up!
FeedTheMe is open source and free. Run it yourself if you like. If you don't like it, patches are welcome.