There is a very good article on VentureBlog about RSS. Its history and what makes it different from push media products like PointCast and Marimba from the mid 90's. The article lays out the landscape and has a really interesting section on the future of RSS - it's enterpirse applications, agent tech possibilities. If you haven't yet take a look at my note and link to Erik Benson's use of RSS feeds as a personal aggregator.