On The Web

1. Get adb to be able to connect to the Fire:
- Add "0x1949" in a new line at the end of ~/.android/adb_usb.ini

2. Install zergRush:
- Download zergRush
- adb push zergRush /data/local
- adb shell
- cd /data/local
- chmod 755 zergRush
- ./zergRush

Links:
Rooting the Amazon Fire Tablet From My Mac
Revolutionary - zergRush local root 2.2/2.3
Developing on the Kindle Fire
Hacker Shows How To Easily Root the Kindle Fire