It’s available o draft of the document that defines the Action Script 3.0
Click here
Leia também =D
Action Script 3.0 Language Specification
createEmptyMovieClip no more!!!
Type checking in ActionScript 3.0
ActionScript 3.0 and AVM2: Performance Tuning
ActionScript 3.0 Cheatsheet!!!
Passar o valor por referência ou criar uma copia do valor no Action Script 3.0?
Tipo de funções no Action Script 3.0
Zinc updated to support Flahs Player 9, Action Script 3.0 and Flex 2
createEmptyMovieClip no more!!!
Iniciando no Action Script 3.0