Thanks Daniel! The exact use case: As a college newspaper, we have a continually changing list of contributors to our paper and they sign up for as many sections as they're interested in (News, Features, Sports). The exec and section editors (whom will have Editor privileges or above) are responsible for sending out an email to these users once a week.
The edit flow user groups would consist of "Features Contributors", "Sports Contributors", "Executive Staff", etc...
So, it would be great for the admins to have an up-to-date list and to keep everything all in one place, accessible and public. The emails don't need to be extravagant, just text-based, and the users should be able to respond to the sender but not to the whole group.
A plugin like "Email Users 2" would be exactly what I need, it just doesn't recognize the Edit Flow usergroups as groups.