I just got a catalog from tirerack.com called Inside Track. Inside has a good amount of testing on winter tires.
I looked to see if it was available online so you all could view but it appears it's not (yet) only the summer issue.
However you can check out the same test via video, which I find even more interesting.
Check out - Video Center
The link shows break test in snow and ice as well as around curves and gives good detailed info as far as stopping distances and acceleration times.