From the venerable Dieter Rams:
- Good design should be innovative
- Good design should make a product useful
- Good design is aesthetic design
- Good design will make a product understandable
- Good design is honest
- Good design is unobtrusive
- Good design is long lived
- Good design is consistent in every details
- Good design should be environmentally friendly
- Good design is as little design as possible
[Via GigaOM]