Can anyone help me to find some material that would be useful in making the transition from as2 to as3? The most helpful would be something that explains the major differences between the two. I'm just starting this work and I found, for instance, I can't add actionscript to a movieClip??
All code in AS3 has to be placed on a timeline. There are probably a variety of resources which you can find by searching Google. In the Flash help documentation, if you do a search on "Actionscript 2.0 Migration", you should find a result with with that title. It is a tabulation of all the AS2 code that changes in AS3. I forget if it includes anything that hasn't changed as well.