If you’ve been waiting to upgrade for a current iOS version jailbreak, now is the time to do it. It works on every iOS device except, alas, the freshly minted iPad 2.
If you’re curious why there is no iPad 2 support; the exploit requires a bootrom or iBoot-level exploit which currently the iPad 2 has been holding out against. For everyone else, however, it’s a great way to upgrade to 4.3.1 and enjoy untethered jailbreaking. Hit up the link below for more information.