To coincide with the recent subject matter discussed on the Order 66 podcast, I want to pimp out a program I've been using lately in my games. Syrinscape is an audio file player and 15 slot soundboard.
GMs can set up 6 different audio channels to play music, sound effects, and sound loops at random intervals as background to their gaming scenes. Punctuate that tense negotiation with the Duke during a royal dinner by having mood music, crowd dinning noises, and crackling fire from the fireplace in the background. Immerse your players trying to hold back a legion of Stormtroopers with blaster bolts, explosions, swinging lightsaber sounds, and dramatic scores from John Williams. Even something as "mundane" as sitting in a tavern or cantina disucssing the PC's next course of action can be enhanced with approriate sound clips as background noise.
It takes a couple hours of investment to find and rename all the audio files, and place them into "states" that you can call up as needed, but once you do it they're ready to roll at any time.
I love this program. And best of all, it's free.
GMs, if you want to enhance your games, give this program a try.