Resources

Adobe After Effects product page

Adobe After Effects official Forum

AE Enhancers: expressions/scripts/presets for After Effects

AE-Scripts: plugins & scripts for AE, including tutorials for how to use them

AE-LIST: great mailing list for After Effects users

Boris FX: makers of the Continuum plug-in package for AE

CycoreFX: The creators of Final Effects and Cult Effects are back!

istockphoto: large collection of inexpensive royalty-free images 

MotionScript.com: Dan Ebberts’ resources for AE expressions and scripting

MotionWorks: hosted by John Dickinson - AE tutorials, tips and training

Pond5: Open marketplace for buyers and sellers of royalty-free clips 

Red Giant Software: plug-ins and special effect tools

RE:Vision Effects: variety of plug-ins for AE users, including

Toolfarm: plug-ins, software sales, training

Trapcode: Peder Norrby's plug-ins (Shine, Particular, Form, and more)

Zaxwerks.com: add 3D to After Effects with Invigorator, Pro Animator, and more