If you're working with a club, team, or a long-term project group, you really need to learn about Google email groups. They're easy to set up, and they make communications so much easier. Using email groups is really a basic 21st Century skill, so you might as well learn it now.
If your group needs a more versatile space to communicate and collaborate, then learn about Google Groups. Google groups give you a webpage to log into and see topics and replies, but they also give you a lot more than that. If you're running a group, and you need to keep everyone in the loop on information, and you also need to assign tasks to various individuals, then you should definitely investigate Google Groups.