Plugin for MU Sites Plugin Use…?

Is there a plugin out there or a hack for WordPress MU that can tell me which of my networked sites are using what plugins? When I am in the Network Admin I cannot see which sites are using what plugins, so if I am looking to clean up my plugins and delete a few, I have to visit each site’s Plugins Enabled section to figure out what is and isn’t being used in order to determine what is safe to remove. While I firmly believe it should be built into WP, I am curious if anyone knows of this being added via plugin or hack.

And the only plugins which cannot be removed are those activated by the primary domain. I currently have 20 plugins that aren’t being used by my primary domain, however I’m not sure which of my 20+ other sites are using them, so can anyone point me in the right direction? Thank you!