Headset Uses Bone-Conduction Technology
Wired reports that a new headset is on the way to solve all those background noise problems you have had with your cell phone in crowded areas. This new bluetooth headset uses "bone-conduction" technology that converts vibrations from you jaw into sound. The article claims it should be available as early as later this year for around $200.
In Japan for instance:
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http://www.thingsasian.com/goto_article/article.2