Some time ago I mentioned that the site's ability to email you registration information was erratic. It turns out there was some population behind aggressive ISP-level spam filtering that would scythe down MGoEmails before they reached people in this group.
An effort was made to fix this, and given the results of a group of test cases it appears to have succeeded. So: if you tried to register at any point in the past and were unable to get login information you can try again and this time it should work. If it doesn't, please email me.