Greenpois0n works best for jailbreaking because its faster, easyer to understand, and way better looking (belive me i spent 3 months learning about jailbreaking). Yes GP can be Harsh and not jailbreak your ipod but its because you need to have ios 4.2.1 in order for it to work. GP gives you a skull when you turn on your ipod instead of the regular old boring apple :] just go check it out before you jailbreak with anything else because GP is the best