Hush
I just got a set of noise cancelling headphones.
I got some of the cheapest ones I could find just to check the technology out and I like them quite a bit. They probably aren't as good as my old Sony headphones in terms of audio quality, but they do blank out a lot of the background noise in the office so you don't have to listen to music quite as loud. Plus, they sound decent if not crystal clear. The next test is a cross-country flight.