This is really really old but fricking amazing. Wear headphones and listen to this: http://www.digg.com/tech_news/Holophonic_Sound_-_Audio_So_Real_It_s_Scary The better your sound card is the better it works. EDIT: and this one http://www.sound-ideas.com/mp3/dimensionsfx.mp3
Dude, those were nuts. I thought it was crazy on the first where it didn't just change from side to side, but up and down and in front and behind too. Haha, I kept having to look around me to make sure something really wasn't going on. Just imagine how scary it would be to play something like Doom 3 with sound like that.