Zappos has an interesting way of testing new hires, after four weeks if you're not happy about the job and the company, they'll pay you your full salary for the time you've been there, and give you a $500 bonus (possibly $1,000 soon). The reasoning is if you haven't bought into what the company is about, you probably won't be the type of Zappos employee they need.

Oh, also they expect about a billion dollars in sales this year.

If you're not following Zappos on Twitter, you should. They're one of the few companies understanding how to use Twitter as a component of their company.