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.

This script creates a new camera and sets point of interest, position and orientation keyframes so that the camera successively faces each comp layer.

A practical application of a layer space transform.
Not very new, but still very useful.
by Dan Ebberts's resource for After Effects scripting and expressions

Photoshop files can contain layer sets, groups of layers that are imported into AE as precomps. Unfortunately these precomps are always the same size as the main comp.