Being the savvy RSS guru that I am, I came across this post in my Google Reader subscriptions:
I am quite jealous by how they creatively presented this topic, that I've often times had a hard time describing to non-techy friends. They accurately describe, in the simplest of terms how RSS works, and the benefits it gives to users.
Even if you've written your own RSS aggregator (like yours truly), you should go on over and check it out. It will at the very least, give you a great way to introduce RSS to your friends, and why they should use it.