PwnageTool will work for the iPhone 3GS assuming you have already Pwned it at 3.0 or 3.0.1
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jailbreak
Sucks for those who already updated to 3.1. I miss multitasking… Aka listening to pandora while browsing the web.
if you have already updated to the official 3.1, there still is no known way to unlock your device. In order to unlock the 3.1 software on a iPhone 3GS, this next version of the PwnageTool will be needed to make a custom IPSW file to preserve the 04.26.08 baseband firmware.