I am right now working in a computer network lab. There are 17 racks of computer gear running, as well as the airconditioning needed to keep it operating. The noise in here is much worse than on an aircraft. So out come the E3's and my Dell Axim X50v and out goes the noise while I listen to my choice of music.

Of course lots of the PC's in this lab are folding for the FlyerTalk team!