CES 2010 had a lot of awesome headphones on display, and Audio-Technica had many. One of them was the ATH-ANC25, a headphone that can block up to 80 percent of environmental noise with outstanding sound quality, comfort, as well as portability.
It can detect environmental noise via miniature microphones incorporated into each earpieces, and applies a corresponding sound canceling signal. It comes with a detachable cord, and runs on a AAA battery that is included. It will be available in February for a price of $99.95.