What skills to get hired at a Silicon Valley tech company (Google, Yahoo!, Facebook, etc.)?

I assume that a person wishing to be seriously considered for employment at one of these SV Tech companies must know several programming languages fluently. Which ones? What other major skills are a must in order to be considered?

I guess I'm also wondering what the day-to-day job is like for someone in the $60K salary range. Do they basically sit and write code all day? Do they work independently or does a manager check on their work every few hours? How often do they have to go to meetings (if ever)?

What's it REALLY like to work there? But the list of skills to learn is the main point of my question.

Thanks in advance.