I have a WordPress MU instance installed.
I allow self-registration, and self-creation of blogs.
I have a user who has created a blog for a Chemistry class. He wants his 100 students to be able to self-register and become authors on this blog.
By default, when you follow the WordPress MU register link, you are signing up for a site-wide account not for this specific blog.
How do I do this? It would be very painful to have to add the 100 students one by one as the administrator. Besides that, we don’t actually have a list of the 100 email addresses.
I need a way that people can either request to become part of the blog, or automatically start contributing right away.
Try asking in the BudyPress forums, BudyPress is a social networking plugin for MU. (It might actually be closer to what your looking for)