Apologies motoford, we are currently building this thing and are opening it up to other people in phases. To make sure we are not just building yet another nice-to-have tool but something that actually improves the way people communicate, we wanted gather people's genuine feelings on this issue - not just collect email addresses.
Of course, I'm happy to remove you (and anyone who signed up by accident) from the mailing list - send me an email to ben at zeninbox dot com :)