Essential Questions
Sample chapter from a book by Jamie McKenzie on essential questions, explaining how they differ from traditional "school" questions. Examples for different age levels are provided.
The Power of Educational Technology: 9 Common Principles for 21st Century Schools
Principles for 21st century schools like rewarding risk taking and teaching empathy. I don't think I've seen anyone else put empathy on their list of 21st century skills, and I'm not quite sure how you teach it.