It's a simple interactive road map. Team e-mails go into project stages of any flow or complexity.
Basically they just e-mail amongst themselves and Cc the project on everything and use #hashtags in subject lines. Proj.email does its thing in the background.
Participants can either schedule task lists to be delivered to them periodically, or they can fire off a blank #whatsup to a project and get back a summary of what's up.
We don't use passwords. Passwords are stupid. Instead we shoot a little email to your inbox. Just hit reply & send, and voilà! You've proven your identity. This just as secure as other systems that reset passwords over e-mail.