As promised, the iPhone Dev Team has released RedSn0w 0.9.13dev1 for both Windows and Mac. This latest RedSn0w update is for developers only, as it allows you to perform a tethered jailbreak on iOS 6.
If you're not a legitimate developer, it's advised that you stay away, as there is no Cydia install performed with this jailbreak. The only thing you will have access to is SSH or afc2, which are certainly useful, but you have to know what you're doing.
Check inside for more details, and the download links...