Following recentreports of third-party iPhone power-adapters that were malfunctioning--"malfunctioning" in this case meaning "electrocuting their users"--Apple has introduced a take-back program for the things.
As reported on 9to5Mac, starting August 16, you'll be able to bring any USB power adapter to an Apple Retail Store or authorized service provider, and the company will take that adapter and make sure it's disposed of in an environmentally responsible fashion. If you want a new adapter, the company will--for a limited time--sell you a new, official Apple one for just $10. (They regularly cost $19.)
The offer is good through October 18, 2013, and is limited to one adapter per iPhone, iPad, or iPod you own. (You must bring the device with you for serial-number validation.)
This isn't just altruism on Apple's part. Headlines linking 'iPhone' and 'electrocution' are generally bad for business. More importantly, the program provides some justification for the company's strict--and some would say draconian--hardware-certification programs.