I saw this in the most recent issue of Wired. Yep, the inner geek is there once a month, or more. Alpinestars Tech Air is an electronic, wireless, airbag protection system that offers state*-of*-the*-art, active rider safety for track and road use. Ten years of ground-breaking research and development, along with testing in MotoGP and World Superbikes has resulted in a compact, ultra-lightweight (450 g) and entirely self-contained safety system that offers the most advanced rider protection possible. read more here here
Read about it in one of my bike mags, fine technology, beneficial in "certain" instances. Would like to see more protection for the neck area, perhaps oneday it'll come to fruition.