After Effects CS3 Scripting Guide

Adobe is already offering a scripting guide for AE 8/CS3 at the Developer Center.

Here's more AE scripting & Flash resources:

• JJ Gifford's Expressions in After Effects is basic but very useful.
• redefinery from Jeff Almasol has a great script library along Scripting Fundamentals.
• Motionscript is Dan Ebberts' resource for After Effects scripting and expressions (and there is a difference).
• AE Enhancers is THE scripting forum for AE.
• Dr. Woohoo specializes in AE<->Flash integration where Adobe leaves off.