You can think of RSS like a TCP/IP packet. A source publishes an RSS feed and the feed worms its way through the Internet to get to you.
Things get more interesting when the feed is routed through a bunch of services before it gets to you.
When you route a feed through a slew of services, RSS becomes a protocol for Machine to Machine (M2M) communication.
A packet is the fundamental building block of low-level data on the internet. Will RSS become the fundamental building block of Web 2.0 and the Internet Operating System?