UX Matters have written a summary on some of the Principles of Great UX Design. The article is a summary of a panel discussion written by Janet M. Six, covering Design Principles …
Different kinds of Design Principles
Uday Gajendar has written about the different kinds of Design Principles. http://www.ghostinthepixel.com/?p=901 He mentions at least 4 kinds of principles: Cultural Systemic Tactical Legendary