A friend of mine bought all kinds of Star Trek gear- a phaser, the flip talkie thing and a panel she installed by her front door that makes the wooshing sound whenever anyone walks by it.
It is waaaay cool! (I think she bought it from www.thinkgeek.com)
I forgot about getting one of those a few years ago.
One of the supers has a ST new mail alert that can be heard loud and clear on the floor.
I use the L&O chung chung sound myself.