Can "wisdom of the crowd" predict a marathon time?

[MattCollister]

I follow this "Freakonomics" blog, and one of the contributors attempted to predict his marathon time using a "wisdom of the crowd" approach. Interesting idea, but in his case, the prediction was off.

freakonomics.blogs.nytimes.com/2008/06/04/postcard-from-sweden-marathon-edition/