Multi-Site WPMU w/ site admins per wpmu instance

I’m working on a wordpress MU + Multi-Site website and I’d like to be able to define Site Admins per instance of each WPMU. This way they can administer each blog/user under that blog.

I saw that this is accomplished with WPMU-Enterprise.

The download link for that plugin isn’t working so I’m wondering two things.

Can this be done in Multi-Site or does anyone have a working copy of the Enterprise plugin?

Thanks in advance.

Dustin