This article by Mark Sigal disucsses 2 compelling applications that have RSS at their heart and demonstrate how RSS could/should be at the center of the new web.
Envisioning RSS as a Web 2.0 platform
“RSS began its life as a really simple way for content providers to syndicate their content and for content consumers to subscribe to their favorite providers. When the blogosphere emerged, RSS really took off. Now, just as its “simple” technology cousin, HTML, provided the underpinnings of the Web 1.0 technology platform, RSS is emerging as a platform for delivering the broadband and mobile ready applications of a Web 2.0 enabled world.”