Matt Mullenweg is now Automattic's CEO
poststat.us
poststat.us
Scott Berkun worked there for over a year and then wrote a book about his experience. Probably as good of a resource you'll find, and a quick read. I reviewed the book here: http://www.poststat.us/year-without-pants/
+ Check out their source code in a web browser
+ Check out their HTTP headers
+ Check out their 404 page
+ Look for a humans.txt file
Every once in a while, a company that has an engineering team with a sense of humor will hide an Easter egg in one of these places. And sometimes, it's a job posting.
Anyone know of other somewhat common places that companies use to hide Easter eggs?
Note: this is an advanced Easter egg hunting technique.