Bake properties with detection of gaps and linear interpolation.

A handy little expression to stop a nested comp playing till you want it to

YY_MagicKey is a very powerful keying plugin, minus the complicated settings. It was designed specifically with the keying-out of premultiplied stock elements (explosions, blood, muzzle flares, etc) in mind, and never takes a long time to set up.

SplatterType is a preset that will allow you to create amazing ink and paint splatter animations with just a few clicks. Based on a special font type.

Create an awesome Tilt Shift effect using a linear focus area.

This is a script that is used to make layers blink in and out automatically tracking with their in and out points.

A quick tip on creating "super tight" garbage mattes to aid keying.

The "Wobbly Keyframe" problem has been plaguing After Effects animators everywhere. greyscalegorilla made this short cast on how to get rid of the problem.

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)