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Yesterday, the iPhone Dev Team released a new version of PwnageTool that adds one long awaited feature…..3GS compatibility.  iPhone 3GS users wanting a pwned version of 3.1 can finally fire up their Macs and create their own custom IPSW files and get their jailbroken 3.1 on.  The version you want to grab is 3.1.3 and before anybody asks NO there is not a Windows version of PwnageTool and there never will be according to the dev team.  So if you want to do this you’ll need either access to Mac OS or patience while you wait for redsn0w to be updated.