http://www.google.com/enterprise/apps/education/
Another great way to collaborate with your students while not in the classroom. Google docs are a great way to share and collaborate information.

Skype in the Classroom https://education.skype.com/
Easy way to communicate with other people around the world for educational purposes.

A easy way to make a classroom website for communication to parents and students

One of the many ways to collaborate with parents, teachers, and students while not at school.

This website is like Facebook for the classroom and is a great way to get information out to the students and parents.