Here's a little tip of the day for those of you who want to collect email addresses to add to your mailing list (and that really should be everyone!). Just put a link on your site to the URL:
So for, example, http://cce.usyd.edu.au/enrol/mail
are the mailing lists for one college.
Once you have done this, any mailing lists you create in onCourse and mark as public will be there for the world to see and subscribe to. In the onCourse CMS you have control over which fields are mandatory and which are visible to users trying to subscribe. So you might want to collect just the name and email, or the full street address.
Once you have done this, it is a single click inside onCourse to send an email to everyone on your mailing list, export to CSV for a mail merge or even to send an SMS announcement.