Marissa Mayer's - Google's VP for Search Products and Users Experience- speech about what keeps Google innovative.

They are:

1. Ideas come from everywhere
2. Share whatever you can
3. You're brilliant, we're hiring
4. A license to pursue dreams
5. Innovation, not instant perfection
6. Don't politic, use Data
7. Creativity loves constraint
8. Users not Money
9. Don't kill projects morph them

Marissa Mayer at Stanford University(Video)

source: Youtube.com and Google.com