Not sure this is even worth 2 cents, but… In no particular order, and not written in stone:

• Less is usually more
• Do not make people feel stupid
• Design for probable, no possible
• People just want to accomplish their goals, and being educated is often not their goal
• Design is to help people better accomplish their goals
• The more expert, the less aware a person is of their activities
• Design is about problem finding and problem solving
• Design problems are the problems people experience
• People are generally more motivated by avoiding pain than by increasing pleasure
• Ask all the truth, but ask it slant
• Personas and scenarios are ultimately means to an end.
• Upstream costs and effort saves greater downstream costs and pain
• Functionality should announce its presence