GeoHot releases Blackrain jailbreak utility tool. Apple iOS versions 3.1, 3.1.1, 3.1.2 firmware can jailbreak with using this tool such as iPhone 2G, iPhone 3G, iPhone 3GS, iPod Touch 1G and iPod touch 2G. When you use this tool to jailbreak iPhone 3GS or iPod touch 2G, you must run it as tethered. Others you can run as untethered.
Download and install Cydia with Blackra1n tool is easy. Course you just want to single click to process it. Blackrain is available for both Windows and Mac users. Here are the download links.
Blackrain 3.1.2 For Mac users.
It is very easy to jailbreak with this tool. windows users must run the blackra1n exe file as an Adminstrator.
Here is the list of Blackra1n supported iDevies
iPod Touch 3G
iPod Touch 2G
iPod Touch 1G