Writing a book???

My good friend and fellow science nerd, Sherrie, and I are seriously considering writing a book this summer.  Our idea is based on this blog - we want to provide a framework for managing a creative and engaging classroom for the Upper Grades.  Of couse we want it to follow our kid-centered and inquiry based philosophy.  We are working on our ideas now, but are thinking about these general topics:

Relationship Building
Class Management
Engaging Activities to motivate our preteens
Cross Curriculum ideas and strategies
Notebooking in all subjects

We envision a VERY teacher friendly book - complete with resources.  What are some topics you think are important for the Upper Grades???

We would love some suggestions to get our brains going...