The firmware is still in the very early stages and in fact only stated working a couple days ago, but GalaxyUser has already gotten the camera, Bluetooth, and Wifi working. He's even posted some screenshots:
But the sound isn't working yet, nor is the SD card slot being recognized by the firmware. Galaxy User is planning to also get the phone functions working as well, though he doesn't know how long that will take.
The Nexus S is a 2-year old smartphone with a 4" screen, single-core 1GHz Samsung Hummingbird CPU, and a 5MP camera. While this tablet has gotten a recent update to Android 4.1, having the new option of installing an Amazon firmware is going to set the smartphone apart from the pack.
So far as I know this is the first time anyone has ported a Kindle Fire firmware to another device. Most every other project I know of involved hacking the Kindle Fire (or Kindle Fire HD) to add new features, a completely new ROM, or new apps.
You can find the firmware over at XDA, along with instructions and a list of what's still not working. As always, this might not work. Caveat Emptor.
via XDA Forums