I've been trying out Microplaza - a site that displays links from Twitter. My contacts tweet a lot of URLs to good content, and now I can see just these link-tweets, sortable by time and popularity. The neat thing is that when one of my contacts posts a link, I get to see all the other folks who posted it too, which gives a larger sense of who's thinking about what.
At this point you need an invitation to try the service. To get one, follow microplaza on Twitter, or ask me - I have 5 invites to give out.