Some more information for the curious: http://builtwith.com/wired.com
Their theme is called "Phoenix".
Being a "small time" WordPress developer I'm always fascinated by "big media" implementations of WordPress, and their decided upon hosting/server setup.
Can't say I'm thrilled with the new Wired.com design (those category icons...ouch), but it's always been somewhat of an ugly duckling, and I'm happy to see they're still taking changes.