I've heard too many complaints and problems from jailbreaking. Either an app won't work, the ipod gets messed up or the ipod has to be re-jailbroken. So, what are the chances that all or any of this will happen if I jailbreaked (jailbroke?) my ipt2g? Also, I've already upgraded to 3.0 and have heard that you can't jailbreak once the firmware has been upgraded. Is this true?