Apple has 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.
Today is the first day of the recall, so tonight I went to the Apple Store at Kahala Mall to make the exchange. A couple of people were there to do the same thing and the wait was minimal. You need to return the old adapter and the Apple Store needs your serial number to process the exchange. You can find your serial number right in your iPhone at Settings --> General --> About.
You know you have the new one because there's a green dot sticker on the face of the adapter. I know it's hard to see in the picture I took. The lighting in my bedroom is horrid.
If an Apple Store is not at a convenient distance to your home, you can order it via this webpage: https://supportform.apple.com/200809/
If you do the exchange through the web, make sure you mail Apple back the old adapter otherwise you will be charged $29.
And for those who care, here's a map of my latest cross-town walk using the iPhone app Distance Meter: