Sony figured out two reasons people don't buy flagship noise-canceling headphones—whether Bose or Sony or others: they're awfully expensive and freakin' huuuuge. The MDR-NC40 coming out in March costs $100, and is both cheaper and slimmer than the bulky $400 NC500D. This set runs for 40 hours on a single AAA battery and can be used as passive headphones when the battery runs dry. Most importantly, you can fold them up into their leather case and slip them into your bag without causing a massive luggage hemorrhage. [Sony]