Googley Design Guidelines

Jon Wiley, User Experience Designer for Google Apps, outlined some of the most important principles for designing interfaces at Google. I thought this is also very relevant when designing other systems or applications.

1. Useful: focus on people - their lives, their work, their dreams.
2. Fast: every millisecond counts.
3. Simple: simplicity is powerful.
4. Engaging: engage beginners and attract experts.
5. Innovative: dare to be innovative.
6. Universal: design for the world.
7. Profitable: plan for today's and tomorrow's business.
8. Beautiful: delight the eye without distracting the mind.
9. Trustworthy: be worthy of people's trust.
10. Personable: add a human touch.

http://googlesystem.blogspot.com/2008/03/googles-design-guidelines.html