EDMODO!!!!!

      I am absolutely in love with this tool!  Edmodo is an online classroom in a way.  Lets say you teach multiple classes one for 8th grade, and 7th grade history; You make different groups and have your students make an account give them the account code to join.  You can assign homework, class work, or other tasks to the groups, and you can make quizzes, and polls. Also you can make alerts to the groups saying for example: Midterm Friday! As a reminded letting students know ahead of time. Posting notes to the group maybe in the note share some useful ways to study for the upcoming midterm.You (as a teacher) also have a grade book and calender tool.
The pros of the tool... The ease of making an account
                                  Staying connected with your students
                                  Reminding students when a big exam
The cons of the tool... Students may not have a computer

Visit Edmodo at http://www.edmodo.com/home