The iOS 6 untethered jailbreak was recently released to the public thanks to the @evad3rs. The jailbreak exploit used by evasi0n was made exclusively for this particular tool. However, ih8sn0w has released a significant update to sn0wbreeze — bringing it to version 2.9.8 — which finally supports jailbreaking iOS 6. If you have yet to be jailbroken on iOS 6, then take a look at the iFans ultimate guide to the iOS 6 jailbreak. If you plan on jailbreaking using sn0wbreeze, then hit the link for the full step-by-step.