1: Make it more obvious that I can register when looking at the login page.
Could make a side by side login and register forms on the same page. See:
2: Split up registering and choosing initial groups to join.
When registering, I see only my contact info on first page. Then when I save and register, I get to choose my groups on the next page, or possibly after confirming my account via email.
3: Improve Group directory display
Make taxonomy for groups
Make "Choose my groups" and atrium.schoolfactory.org/og pages use the taxonomy to organize group display like it does here:
Make the "Choose my Groups" page display Group Name, Group Mission, and group by the tax term (Group Type?)