Teamie is a site I just found out about from a friend on Twitter, that reminds me a bit of Moodle. This is a site that allows users to create a social network for online classrooms populated w/ teachers and students. For educators this is a great place to create online quizzes and have them automatically graded. Students then can view their online gradebook. Also, this is a great place for teachers to collaborate w/ parents via the cloud.
I recommend checking out Teamie by clicking here.