Of the dozens of request-for-help emails I get every week, one of the most common topics is general suggestions for actionscript optimization. There are numerous online resources for this topic, one of which is the ActionscriptWiki page. John Grden also has a nice post on this topic.
I’m a big fan of Polygonal Labs, and Michael has numerous posts such as this one that deal with fast approximation algorithms. This is another good one from his Actionscript category (well worth your time).
I believe I’ve mentioned Joa Ebert’s paper before in this blog, but it’s worth repeating. Post your favorite techniques and resource sites.