Glassdoor is a site that allows employees of various corporations to rate how they think they're management is doing anonymously, and the company has shared some info with TUAW that it says comes out of Apple's campus in Cupertino. The site works kind of like Yelp for employees, as users can come along and leave ratings and reviews for their own company. But presumably this information came from anyone who works for Apple, not just the employees that work directly with CEO Tim Cook in California.
And what's the word? In short, they love him. Cook has never had anything less than a 92% approval rating since this time last year, and his current approval rating sites at 93