There is a new gear-analysis website, Elitist Armory. It is from Shadowed, who developed the Elitist Group addon, and uses the same logic. (It’s the intelligent alternative to gearscore.)
The site lets you analyse gear (helpful in a PUG, for example), or apply those tests to an entire guild or realm. You can find the DK tank with highest average ilevel, check the appropriateness of gear/talents/enchants across your guild, and more.
I am supporting the site by donating CPU and bandwidth for the armory lookups. We have a forum thread on this topic.