MSM and the Blogosphere is talking about the injured racehorse Barbaro, according to Yahoo Buzz. 

Searches for Barbaro were on a fast track this weekend, rising nearly 2,000% into the top 200 searches. Horse racing fans appeared to be keeping a close watch on the drama through Search. Queries for "barbaro injury," "barbaro injured," and "barbaro update" all spiked during the weekend. Following over four hours of surgery on his serious injury, definitive news of the horse’s fate is still forthcoming, including the odds on his survival. But if Search is any indication, Barbaro will be a winner to racing fans for a long stretch of time.

I think we can use Yahoo Buzz as a way to determine what is popular at any moment.