Jailbreak Your iPhone 3GS, iPhone 4, iPod touch 3G, iPod touch 4G on iOS 4.1 using limera1n
More info and download link: http://stateofjailbreak.com/tutorials/limera1n/
In this video I show you how to jailbreak your iPhone 3GS, iPhone 4, iPod touch 3G, iPod touch 4G and iPad on iOS 4.1 using limera1n. This jailbreak will not work if you have an iPhone 3G or iPod touch 2G. If you have an iPod touch 3G 8GB model this also will not work. limera1n is an untethered jailbreak that allows you to jailbreak your device easily. However it is fairly unstable so proceed at your own risk.