With Google Groups, you can create online and email-based groups. There's a lot you can do with Google Groups:
  • Engage in discussions about a specific subject.
  • Create a question and answer customer support group for a product, such as a piece of software your company has written.
  • Organize meetings, conferences, or social events among members of a group.
  • Find people with similar hobbies, interests, or backgrounds.
  • Read group posts through email, the online interface, or both.
To get started with Google Groups as a regular participant, learn how to find and join a group. To get started with Google Groups as an administrator, learn how to create a group.

Some helpful tools for creating comma separated lists (for adding members to your group):

Using Google Groups in the Classroom