Ask HN: I have an interview with Google in a week. What should I prepare?

I have an interview scheduled with Google in a week's time. It's for a Developer position. I have 7 years of experience mostly with Java, Scala and Ruby. I am shitting bricks as I am a Google fanboy and this opportunity is my Atlantis.

How should I prepare in a week and go about it?

Feel free to ask any questions you may have.

Throw Away account because I am not taking any chances.