I don't know what the hell some of you guys are on, but he's asking if 2.2.1 is Jailbreakable. Not 3.0, not unlocking.
Yes, 2.2.1 is fully Jailbreakable. Remember, once something has been Jailbroken, every new software update is still hackable, forever. The only thing that would stop a Jailbreak is a hardware update, meaning a new exploit would have to be found. this mean the new iPhone 3G S (which is a new hardware update) will not be hackable, because a new exploit must be found. Once an exploit has been found for the iPhone 3G S, it will be hackable forever. But you don't have the new iPhone (since it's not out yet), so no worries 😛