In a nutshell Zorro makes selection and isolation sets easy and possible in after effects by adding tags to layers. Similar to the way you would tag photos in Flickr, you can tag layers in your comps and then select or isolate those layers in groups by using the tags. If you are curious but confused there is a Video Tutorial that shows how Zorro works. As with all my scripts, Zorro is free.
http://aescripts.com/zorro-the-layer-tagger/
-Lloyd
