Fits selected layers proportionally to fill the Comp frame by giving you the choice of either cropping or letterboxing.
Navarro Parker said: How is this different than the existing Fit to Comp Width (⌥⇧⌘H) and Fit to Comp Height (⌥⇧⌘G) commands?
It respects the layer rotation. This detail is covered in this tutorial which explains why I created this tool since those commands did not work for batch resizing: http://ae.tutsplus.com/tutorials/workflow/create-a-rockin-automated-slideshow/