Adobe After Effects CS4 * Expressions
http://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906c6dea-7a39a.html

Tutorials

VIDEO COPILOT
http://www.videocopilot.net/tutorials/

MaxAfter
http://www.maxafter.com/index.php?option=com_content&view=category&layout=blog&id=35&Itemid=57

AE Portal
http://provideocoalition.com/index.php/ryoung/story/after_effects_lately/

Special Effects

Soul Removal
http://www.videocopilot.net/tutorial/soul_removal/

Energy Wipe
http://www.videocopilot.net/tutorial/energy_wipe/

Frosty Breath
http://www.videocopilot.net/tutorial/frosty_breath/

Planet Explosion
http://www.videocopilot.net/tutorials/planet_explosion/

Speed Particles
http://www.videocopilot.net/tutorial/speed_particles/

Assisted Suicide
http://www.videocopilot.net/tutorials/assisted_suicide/

How to remove an actor with tracking and root in After Effect
http://www.wonderhowto.com/how-to-remove-actor-tracking-root-after-effect-284970/

Day to Night Conversion
http://www.videocopilot.net/tutorials/day_to_night_conversion/

Realistic Fog Without 3rd Party Plug-ins | Aetuts+
http://ae.tutsplus.com/tutorials/vfx/realistic-fog-without-3rd-party-plug-ins/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:%20aetuts%20(AETUTS)

15 Inspiring Particle-Based Tutorials from Around the Web - Aetuts+
http://ae.tutsplus.com/articles/15-inspiring-particle-based-tutorials-from-around-the-web/

After Effects Basic Training
http://www.videocopilot.net/basic/

Add a light wrap to keyed footage in After Effects - YouTube
http://www.youtube.com/watch?feature=player_embedded&v=o4LoFizw-yo

color keying tutorials from Andrew Devis (and more) « After Effects region of interest
http://blogs.adobe.com/toddkopriva/2011/09/color-keying-tutorials-from-andrew-devis-and-more.html

Creating Turbulent Noise - Lesson
http://www.video2brain.com/en/videos-6569.htm

Using the Stroke Effect - Lesson
http://www.video2brain.com/en/videos-6577.htm

The Importance of Compositing: A Layer By Layer Breakdown in After Effects | greyscalegorilla/blog
http://greyscalegorilla.com/blog/2010/10/the-importance-of-compositing-a-layer-by-layer-breakdown-in-after-effects/

Motion Tracking and Rotoscoping
http://tv.adobe.com/watch/learn-by-video/adobe-after-effects-cs5-motion-tracking-and-rotoscoping/

Advanced Screen Replacement in After Effects (1 of 2) - YouTube
http://www.youtube.com/watch?v=6FfafEPcXAI

Advanced Screen Replacement in After Effects (2 of 2) - YouTube
http://www.youtube.com/watch?v=nr19J0dalpc&feature=related

Corner pinning with Mocha for CS5 - YouTube
http://www.youtube.com/watch?v=pCDu3SLId3Q

Plug-ins & Scripts

Avid QuickTime Codecs LE 2.3.4 Download
http://avid.custkb.com/avid/app/selfservice/search.jsp?DocId=392959&NewLang=en

Growing Design Elements in After Effects : Adobe After Effects Video Tutorial
http://library.creativecow.net/articles/hansen_jaysen/growing/video-tutorial.php

Fancy Title Plate
http://www.videocopilot.net/tutorials/fancy_title_plate/

Graffiti Writing
http://www.videocopilot.net/tutorials/graffiti_writing/

How to use HDR imagery and 32 bpc in After Effects
http://www.wonderhowto.com/how-to-hdr-imagery-32-bpc-after-effects-18809/view/

Create an Advanced Jumper Effect
http://ae.tutsplus.com/tutorials/vfx/learn-how-to-create-an-advanced-jumper-effect/

Running Water in After Effects
http://www.cgswot.com/tutorial/tutorial_19.html

PSOFT anti-aliasing for Adobe After Effects
http://www.psoft.co.jp/en/product/anti-aliasing/ae.html

Light 3D objects in After Effects with Normality | VizWorld.com
http://www.vizworld.com/2009/07/light-3d-objects-in-after-effects-with-normality/

AE Workflow Tip #2: Rendering : Adobe After Effects Video Tutorial
http://library.creativecow.net/articles/rabinowitz_aharon/workflow_2/video-tutorial.php

Creating a Realistic 3d Earth
http://library.creativecow.net/articles/park_michael/3d_Earth/video-tutorial.php

Analyzing Motion : Adobe After Effects Video Tutorial
http://library.creativecow.net/articles/larsen_carl/analyzing_motion/video-tutorial.php

CineLook 2 and Magic Bullet 2.1
http://www.creativecow.net/articles/johnson_tim/cinelook_vs_magicbullet/index.html

The Ultimate Motion Graphics Tutorials Round-Up | Tutorials | Smashing Magazine
http://www.smashingmagazine.com/2009/05/25/the-ultimate-motion-graphics-tutorials-round-up/

Manipulating RPF files in After Effects
http://www.creativemac.com/2004/01_jan/tutorials/lw2ae2.htm

3D Grid/Video Screen
http://library.creativecow.net/articles/fischer_john/video_wall.php

John Fischer created a much more in-depth version of a combination of tutorials done by www.ayatoweb.com in response to several inquiries in the AE forum at Creativecow. This is a fairly time-intensive tutorial, but the end results are worth it! When you're done you should know much more about track mattes, and some basic 3D camera moves. Hopefully, it will also give you some new ideas to play around with. Enjoy!