Have you already updated your device to the version iOS4 and want to unlock your 3GS? Firstly there was Redsn0w, now PwnageTool is available, which can easily help you. Here is a simple and easy tutorial for jailbreaking iPhone 3GS (old bootrom). Warning: this is not an official release and therefore may be some bugs that can destroy your device or delete some important information. So be careful while using it!

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Hacker msftguy created unofficial PwnageTool which allows to upgrade to the pre-release of iOS 4.0 GM while keeping your jailbreak and old baseband.

This is not an official release by Devteam, so we recommend to wait for the final versions of both iOS 4.0 and PwnageTool.

For the advanced users who want to experiment here is a link.

Msftguy also provided a video:

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