In order to comply with Android licensing requirements, Amazon has released the source code to the Kindle Fire. The 809 megabyte gzipped TAR archive can be downloaded here. Meanwhile, word comes from The Digital Reader that a user has already managed to root the Kindle Fire.
Given that Google just released the source to Android 4.0 the other day, while the Fire still runs a customized version of 2.3, I wonder how long it will be until we see Kindle Fires running Android 4.0? Regardless, Amazon has said that it will not try to prevent people from rooting their Fires. It will be interesting to see if they keep that promise.