Google Reader has a feature where you can mark items from your RSS feed as “shared”, which makes them available on a page that anyone else can see, if they’re interested in what you find interesting. The page then also has an RSS feed of its own, so that you can subscribe to your friends “shared” items.
If you’re interested, here’s my shared items page.
It’s a good idea; I only have one thing I wish they’d change. A couple times I’ve run into items that I’m reading in Google Reader from a friend’s shared items that I’ve subscribed to (Dan’s, for example) and the issue is that if they’ve marked something as shared that you’ve already read, it will come up again from their feed. I’d like it to be smart enough to realize that for a story that I’ve already marked as read to not show it again in reading other shared feeds.