Fortune has published a lengthy excerpt from Adam Lashinsky's Inside Apple, a book scheduled to be released next week that provides an unprecedented look inside a company legendary for its secrecy. I'd encourage you to read the entire excerpt at Fortune, and buy the book when it comes out, but I've included a couple summarized items below to stoke your curiosity.
Many new employees are hired into "dummy positions," and they don't know the details of their work until after their first day on the job.
No one helps new employees set up their computers on Apple's network; anyone hired by Apple is simply assumed to have the knowledge to do it themselves.