I was just in Cydia, getting an update to Maps Enhancer. There was a WARNING. "Do not take the 3.1.3 update. It kills the jailbreak." "The WARNING applies to 3GS, iPod Touch 3, iPod Touch with serial "MC" and any 3G unlockers". "DO NOT UPDATE YOU WILL BE SORRY". There is more: "As of right now, Apple is still signing 3.1.2 for you 3gs users but no one knows for how much longer they will be. Make sure you *rush* into Cydia or Rock and key your keys signed on the front page of you have not. This will make certain you can always restore 3.1.2 even in the future using Saurik's server". "To summarize: -Update adds NO NEW FEATURES, do not update. -Update kills your jailbreak. Do not update. -Get 3gs 3.1.2 keys signed by Cydia/Rock now if you haven't. -Unlock does not work on new baseband."