Why is this important to GIS? RSS is important to GIS because it is one of the powerful ways we now get information and GIS is all about information. There are even specifications about how this is being used to pass around geographically referenced information through the web. This is called GeoRSS and more about it later.
First, I found this great video describing RSS and why it is so important on the web today. Check it out.
A big fat thanks goes to the guys at The Common Craft Show for doing such great work. Check out their site for a lot more!