Headphones that can record their input as MP3

Engadet reports on Aiwa's new ¥15,000 headphones, which can take standard audio input and play it through and/or record it as an MP3 to its built-in 128MB of memory. It's a great idea, and I can think of a million things I would love to use them for, from recording tracks off vinyl records to the air-traffic control chatter on Channel 12 on United flights. Link