Google docs has been one of the best tools I've integrated into my day to day teaching life. Not only is it a great way collaborate with students and for students to collaborate with each other, I have recently been using it to create my substitute documents, edit curriculum, link to edmodo, as a data collection tool for my grade level RTI meetings, and to save all PD documents so they are easy to access at a moments need. If you haven't used google docs, I strongly encourage you to try it. Over the last three years I have gone back and forth from other services, but I always come back to google docs. How do you use it personally and in your classroom?