is the new descendant from Berg's excellent gear ranking which organizes tanking gear for WotLK (and 3.0 I would assume). There are some caveats included as much of the gear stats and game mechanics can still change before they go live. The main plus is that the author has included a calculation for the benefits of Expertise which the old ranking system did not include.
One good point of interest, is that much of the endgame raiding gear we currently have will have some good longevity in WotLK. Defense is going to be more difficult to maintain, so gemming for +DEF may become more attactive at some points in gear progression.