The Kindle Fire from Amazon runs on a forked version of Android 2.3 Gingerbread, and comes with Amazon’s own AppStore instead of Android Market. However, it was just a matter of time before developers gain root access and start porting stock Gingerbread and Ice Cream Sandwich to the device. The developers managed to get root access pretty easily, and have even managed to get a CM7 build to work on the Fire in such a short time.
Now, just a couple of weeks after the Ice Cream Sandwich code went public, some developers over at XDA have managed to put together an Alpha build of Ice Cream Sandwich for the Fire.
Since this is a pre-alpha build, there are some issues including some video playback glitches, no landscape support in the launcher (which can be easily fixed) and some minor audio glitches. However, the developers released this pre-alpha as a Christmas present for the Fire owners, so they cannot really complain much. Interested Kindle Fire users can find the required files and steps over at XDA forums.