New versions of Android always spark off a whole new round of attempts to port the operating system to new devices, and it's no different this time around with Jelly Bean. The Kindle Fire is a prime target for such a port — it has a similar form-factor to the Nexus 7, after all — and xda-developers forum member Hashcode has released a beta ROM of Android 4.1 for Amazon's tablet based off of the recently-released Jelly Bean AOSP source code. Of course, since it's a beta you're likely not going to want to use this as your daily driver; so far the only way to turn on Wi-Fi is by connecting the tablet to your computer and running the adb command line tool. There are sure to be other issues, too: Liliputing installed the ROM and had difficulty getting Google Play to work (see update below). Nevertheless, if you're interested in giving your Kindle Fire a second lease on life with an infusion of Jelly Bean, you'll need to root the tablet and then flash the ROM. It's not for the faint of heart, but Android enthusiasts will be hard pressed to give Google's latest OS a whirl.
Update: Hashcode appears to have linked the wrong version of Google Apps in his guide — as Azazel11 mentions in the comments below, they work just fine if you use this version instead.