Sony Ericsson's motion activated MH907 headset
The buttonless MH907 buds are the world's first "Motion Activated" headphones with Sony Ericsson's "SensMe Control" tech: bung them into your ears to automatically start listening to music, remove one bud to pause. The buds are activated by body contact and mimick the way we control sound now. What's cool is that the headphones seem to use your body as an electrical conduit (a Body Area Network) based on this quote from the webinar:
"Requires conductive surface to activate the controls - i.e. your ears, hence it won't turn things on in your pocket by just squeezing the ear buds"