MobilePress (Mobile-browser compatibility) for WPMU?

I've been playing around with the plugin MobilePress for WP, which points mobile browsers to see a customized low-bandwidth version of the site. I've been trying to get it working so that every site in my WPMU install has it automatically running, but for some reason it will not work.

The target audience for my MU site is college-age students and getting it so that all blogs on the site can load easily on mobile devices would be a huge deal. Has anyone played around with MobilePress ( http://wordpress.org/extend/plugins/mobilepress/ ) or knows some other way to do the same thing?