If for some strange reason you updated to 4.0.2 when Apple released it to patch the PDF exploit that was used for the JailbreakMe jailbreak and your running a iPhone 3G or iPod Touch 2G (Non MC Model) then you can still jailbreak your new protected iOS. The current version of the jailbreak tool redsn0w will still work on both the iPhone 3G and iPod Touch 2G as long as it’s a Non-MC model. Just point redsn0w to the 4.0 firmware to ‘trick’ it then you’ll be away with your new jailbreak.