If you're a returning first-edition reader dying to sink your teeth into this edition, here are the highlights I recommend you start with. But don't end your exploration with this list. Read on to learn about many more important updates to this edition.
The following chapters in Part I, ActionScript Fundamentals, have been heavily rewritten and enhanced. They cover some of the most exciting additions, such as components, and meaningful changes to the way ActionScript handles events and deals with objects.
See also the revised and new appendixes, especially:
The following entries in Part II, the Language Reference, are either all-new or have been heavily revised since the first edition. For example, you'll want to read up on the new SharedObject object and check out the Drawing API methods added to the MovieClip class.
Accessibility object
Button class
Capabilities object
Function class
_global object
#initclip and #endinitclip pragmas
LoadVars class
LocalConnection class
MovieClip class (new events and the Drawing API)
Object class
setInterval( ) and clearInterval( ) global functions
SharedObject object
Sound class
Stage object
System object
TextField class
TextFormat class
Listener Events for Key, Mouse, TextField, and Stage (see Table P-1)