Cross-processing was used during the age of film cameras to give photographs a unique look. Technically it is the process of treating a film with the chemicals usually used for different type of film –like developing transparency film with C41 process.

A few simple expressions to convert from dB to volume-Percentages, this way sound will respond more like opacity...

This script moves/nudges all Transform keyframes in all layers in all comps to the nearest exact frame for any framerate.

This script displays a palette with controls for sorting layers based on specific criteria.

DuIK Tools is a revolutionary Inverse Kinematics script for After Effects developed by Nicolas Dufresne a.k.a DuDuf which brings the principles behind 3D rigging to After Effects, giving greater precision and faster, more lifelike animations!

The script will set up a simple camera rig in your composition with rotation and position controls located in one Control Null. The camera rig also works really well with Videocopilot's Sure Target.

A great time-saving preset to "duck"(fade in/out) a music layer based on a voice over.
"Ducking - Audio Terms Explained - Process of automatic compression, eg when the announcer's voice signal causes the level of music to be attenuated."(from lp2cd.com)

Bleach Bypass is a processing technique used for color film to obtain low-saturated and high contrast images.

Creating a target with crosshairs isn’t a big challenge. But doing it on only one layer is actually quite difficult. This project is really an effects preset (an ffx) as the trick was to fit all the effects onto one layer so they could be saved as a preset and applied to a single solid.

Richard Harrington has an article up at ProVideo Coalition for After Effects that allows you to move projects from Final Cut Pro to AE.(from Popcorn Island)