According to Marc Carig, A.J. Burnett spent some time this winter learning a changeup from perennial Yankee punching bag Arthur Rhodes.
Big ups to Carig here, as this might be the first article in the mainstream media I've ever seen referencing FanGraphs. This is a highly encouraging sign, and perhaps the days of wOBA and FIP being introduced to a mass audience are closer than we think (first the sewers, then the world!).
But man, what the hell would make Burnett want to learn anything from Arthur Rhodes?