Something I whipped up for myself in a few minutes.
This cuts down the code I need to play a sound by about 2 lines haha, but I think its pretty useful, check it out especially if sounds in Actionscript 3 aren't making sense for you. =)
public class FX extends MovieClip
public function FX (type:Object)
sound = new type();
fx = sound.play();
Used like so:
var shot:FX = new FX(gunshot1);
gunshot1 is the class of the sound i want to use, right click your sound in the library (like gunshot.wav), and click linkage. Make its class be something like gunshot1, or mysfx or whatever.