Thanks Greg, pretty interesting. For those looking at snows, they also have a review of a few studless snow tires:
http://www.tirerack.com/tires/tests/...y.jsp?ttid=122
Kind of limited in terms of brands, but I found the most interesting comment to be about optimal wheel slip to achieve peak traction in the snow/ice. Their data shows that can occur at 45% slip, well above the point where traction control kicks in. Support my real world experience but god to see supporting data.