I tripped across Health New Review: http://www.healthnewsreview.org/ (published by Gary Schwitzer
Associate Professor, University of Minnesota School of Journalism & Mass Communication, Health Journalism MA program).
I think the site itself is great but how about modifying this for a class project? Have students find materials on the class topic and then rate and evaluate what they find. I think the star rating system would help student begin to build a mental spectrum of quality as it helps them learn about a topic. You can also develop the "criteria" as a group at the beginning of the semester. You could require students to find a variety of sources individually or in small groups (e.g. newspaper, journal articles, magazines, blog posts, radio or new programs, etc.).