Here is an excellent Wiki on things you can do with RSS. Tim says “Basically, you can perform any task with RSS that requires search or information retrieval from a server. Automatically and repeatedly. I use this list to convince people to start using an RSS feed reader. There’s more to RSS than just weblog syndication and news aggregation.”
Some of the applications that stand out from a KM/Collaboration perspective are:
1.Stay updated on someones schedule
2.What people are surfing. As a matter of fact I picked this link from furl.
4.Keeping track of notes
5.Keep colleagues updated about your latest contact information