Apple has informed that determined that under certain conditions the new ultracompact Apple USB power adapter's metal prongs can break off and remain in a power outlet, creating a risk of electric shock. We have received reports of detached blades involving a very small percentage of the adapters sold, but no injuries have been reported.
The ultracompact USB power adapters were supplied with every iPhone 3G sold in the following countries, and may also have been purchased separately as an accessory:
US, Japan, Canada, Mexico and several Latin American countries.
Note: Apple USB power adapters supplied with original iPhones or supplied with iPhone 3G units sold in other countries are not affected. Users with ultracompact power adapters should immediately stop using them until they exchange them for a new, redesigned ultracompact adapter.
In the meantime, they should charge their iPhone 3G by connecting it to their computer with the USB cable that came with their iPhone or by using a standard-sized Apple USB Power Adapter (with fold up prongs) or with a third party adapter designed to work with the iPhone, such as a car charger.
If you have an ultracompact adapter with a green dot on the bottom, you already have a new, redesigned adapter and do not need to participate in this exchange program.
http://www.apple.com/support/usbadapter/exchangeprogram/
I have the new USB power adapter and it does work well...but remember this..if you have the adpater with a green dot on the bottom, there is nothing you need to do. It means y...
Just want to post another comment and let you know that the updated adapter works really well after 5 months!