Here are some techniques for discovering your values:
Ask yourself (and write your answer) -- who are the greatest people who have ever lived, and why?
What are the most awesome projects/companies/nonprofits that you have ever heard of? Think about what it is about them that you love so much.
Now, reverse engineer your answers. What is it about the people you listed that you admire so much? What is it about the projects that came to mind that excite you so?