Sony Ericsson claims that the buttonless MH907 buds are the world's first "Motion Activated" headphones. Using the company's "SensMe Control" the earbuds play music automatically once they're in your ears. Remove one earbud and the music pauses itself. Answering a call is a little more finicky: remove both earbuds and then reinsert just one to take the call via the headphones.
Unfortunately these are only for Sony Ericsson Fast Port phones so if you were looking to use them with your iPhone, G1 or Pre, you can forget it. Pricing is still a bit hazy with most rumors putting them between $50 and $60.
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