Recent major updates Ive seen some tweaking on the scripts Google uses that seem to negate that
www.domain.com vs domain.com effect - Ive seen some backlinks coming into the www version that are definitely listed onthe other site without a www - so they must be trying
There was a small SERP update that started yesterday - combination of fresh and the effects of the last backlinks update on the 11th. Ive seen some bouncing on listings - looks like some new SERPs on the www-in.google.com server? I dont think they have finished though as they have come and gone - maybe trying some new filters - but doesnt look major from here?