Android 4.0 Ice Cream Sandwitch is now available on Amazon's Kindle Fire. The folks behind this hack at the XDA developer fourm have released a "pre-alpha" build of AOSP ICS for christmas.
Keep in mind that this really is to be seen as pre-release software, don't whine if anything doesn't work. It's got all sorts of nasty bugs, with the biggest drawbacks being that audio/video playback are pretty much 100% broken.
With that said, few communities can hobble together rock-solid hacks as fast as the Android crowd can. Now that the concept is proven, expect this one to come together quick.
Check out the video below demonstrating Android 4.0 on Kindel Fire:
The XDA forum thread promises a flash guide soon. For more information, visti the post here.