Previously Redsn0w RC 11 was rolled out to add Animated Boot Logos on Jailbroken Devices and it was reported some what buggy for some users. So today Redsn0w was updated to RC 12 and all the issues were fixed by the Dev-Team in the latest release of the Redsn0w RC 12.
Download Redsn0w RC 12 for
MAC OS X (Here)
And you can follow the complete guide on how to Jailbreak Untethered from here. Till now this feature has not been added into Redsn0w and this Feature is added in Sn0wbreeze which is called Multi-Touch Gestures. If you want to add on to your iPhone 4, iPod 4 (Till now only 2 devices are supported) you can follow the complete guide posted here.