StackIt is an After Effects script that allows you to stack layers into any sized grids, staggered grids, rows, and columns using selected layers. It'll also duplicate as needed to fill if you want it to. Combined with our Radial Delay script, you can make some pretty dope things with StackIt. It's already saved us quite a bit of time. We hope it can do the same for you.
You can see an early version of this script in action in Workbench's Pump Up the Jam tutorial at the 4:09 mark.
This download comes with the script and a user guide.