ZEM Headphones Cancel Noise Without ElectronicsS

The results: lower weight, lower price tag. Sounds good to me.

Dr. Jozef Zwislocki, an audio researcher, came up with the new technique that uses a simple amplifier to cancel background noise and reproduce purer sounds for these SensGard headphones, which promise to provide up to 37 dB reduction in noise in both low and high frequency ranges.

The ZEM headphones weigh only 2oz, fold up for portability, and will run you $90. (much easier on the wallet than other hefty options. [SensGard via ipodnn]