deadsea - 11:27 am on Aug 10, 2012 (gmt 0)
Despite what the article says, I would recommend cloaking when running multivariate testing.
I always serve Googlebot the version that the most users are seeing. It may be technically cloaking, but the spirit is in the right place. I believe that it is less likely to get you penalized than randomly showing Googlebot different pages every time it visits.