Wired came out with a major article yesterday.
Wikipedia Scanner -- the brainchild of Cal Tech computation and neural-systems graduate student Virgil Griffith -- offers users a searchable database that ties millions of anonymous Wikipedia edits to organizations where those edits apparently originated, by cross-referencing the edits with data on who owns the associated block of internet IP addresses.
Lots of others are chiming in with ramifications and revelations, such as Michelle Malkin and Guardian newspaper. Michelle Malkin says,
Yes, you can now identify and track Wiki vandals at, say, the NYTimes or Al Jazeera. Very useful tool.
Hot Air helps explains how it works.