Maybe this is more for my own than for the public but i think it could be also interesting for you.
Here is a list with Samples of new MM technologies i have found in the last week.
One of the most impressive works are made by Andre Michelle.
A more theoretical way is done by Ralf Bokelberg. He described the new language features of AS3.
Colin Mook has announced a new entry onto his blog, where he is writing about his new book ActionScript Essentials 3.