I posted this on Smashboards and some people thought it was helpful, so why not share this with my fellow B4BC members?
I apologize if you have found this out already, but I haven't seen any posts about this and hoped that at least someone could learn from this.
http://uk.youtube.com/watch?v=wdjuWxzdOz8
First off, before asking what IASA frames are, please read the video description.
As you can see, buffering a shield while landing causes Ike's IASA frames during landing lag to be revealed. While this can speed up your gameplay, it is not as important as L-canceling was. The IASA frames come up about when Ike starts to lift his arm up.
I did some testing of my own; I determined FAir to have +/- 29 frames of lag , then I determined that FAir's IASA frames come up at +/- frame 22. This saves you roughly 7 frames of lag; it's pretty significant, seeing that you can make it even harder for people to punish you after a well-spaced FAir.
While I do not have a video demonstration of Quick Draw having IASA frames, you can do it yourself; first, QD so that you whiff, and notice how there is a slight lag time in which Ike draws his arm up after stopping (look for the white smoke). Next, QD but hold shield; if you look closely, you'll notice that he skipped part of his stopping animation.
Note that IASA frames are most easily seen in 1/4th speed in Training Mode; just buffer your things with shield and you'll see where they are.
Also note that note all characters have IASA frames during landing lag (like Samus); this supports the notion that Sakurai actually tried balancing Brawl at a competitive standpoint. That, however, is not the point of the topic. The point is...
LEARN 'DEM IASA FRAMES!!!