I currently use a portable intercom with an auxillary input plug, I bought a 1/8inch to 1/8inch adapter wire from Radio Shack, I can plug in my walkman, cd player, dvd player from my laptop, an mp-3 player and etc, works great, fairly cheap.
If you are in the market for a new headset sometime soon, the new Lightspeed 30-3g's have a built in plug in recepticle for a 1/8inch plug, you can hook up all the previous items and also it has a cell phone interface, pretty cool unit.
If you need more info on my set up, let me know