At the bottom of each article on National Nine News (Australian MSN), there's a button to "Flock It!" which is like favorit-ing a news story.
The more people who flock a story, the higher up the flock list the story goes. In the sidebar of each story is an interactive graphic that shows readers flocking around the news and stories getting highlighted. The larger the bubble, the more people who have flocked it; story bubbles light up orange when someone flocks it. The site isn't showing any larger sizes, but a full screen version could be fun. Maybe a screensaver.
MSN seems to have have this whole news exploration thing going on lately. I like it.