The iPhone Dev-Team has just outed a new version of Redsnow that opens up iOS 6 to an official version of the sinful, definitely-not-Apple Cydia store, but you'll still have to be tethered to use it. The process is now simpler, as the latest version recognizes your already-installed iOS 6 OS and installs only the necessary jailbreak files, and Cydia is now installed automatically as well -- rather than needing a complex workaround like the last version. If you're willing to put up with the tethering and have an A4-powered iPhone 4, 3GS or gen-4 iPod touch device, the laundry list of how to do it is at the source below -- but there's always the risk of bricking, so caveat emptor, of course.
http://www.engadget.com/2012/10/15/i...ow-with-cydia/