Julie & I worked on information about Tool #9 together, shared it with each other only initially and then once we were finished, we shared it with several other science teachers. This would be great for lesson planning/tweaking. I have already used this some in my classes. Last semester, my students did a project on genetic disorders. They would use Google Docs to create a presentation, share it with their partner while they are working on it and then finally, they had to share it with me. I used the comments feature while grading and the kids had immediate feedback. It worked perfectly!
I created a form with 2 goofy questions and shared with two other teachers. This would be great for quizzes, checking for understanding or even for student-generated quizzes or warm-ups.