Have you been to the website Enter The Group http://www.enterthegroup.com/ yet?
If you are unfamiliar with this website I recommend you check it out! I spent an hour today transferring my files and information for my theatre cast that I had spread out between e-mails, websites, Google Calendar and Facebook and created a central space where I can post polls, files, calendars, chat or e-mail members and post assignments. It is the most comprehensive group tool I have found to date. Oh, and did I mention it’s all FREE? :)