The Power Hawks use a mix of Google Drive and MailChimp.
We use Google Drive to all of our documents, especially using Google Forms for students to fill out for pretty much any event we do. That way we have signups already in a spreadsheet which we can link to others to track payment, paperwork, etc.
We then use
www.mailchimp.com to manage our team emails. It allows us to maintain a list of every email we've ever sent, see who has opened emails and even who clicks on links. We can also use it to manage alumni and community email lists, plus it allows you to create really nice looking emails really easily. As an example of what you can do, this is a community email we sent last year that looks similar to what we use now. Easy to put together, and very nice looking.
http://eepurl.com/UupQT