Tech Info

This has been tested by me and worked on the first try..

Head on over to Geohot’s I Make it Ra1n post for the jailbreak download and details. I haven’t been able to test this yet, but have heard good results from comments and tweets. I’ll be posting a full guide with details once I get the chance to jailbreak an iPhone 3GS with this.
Note: The purplera1n jailbreak software is in beta, and Winterboard does not work with it. As of right now you can only jailbreak using Windows (it won’t work with Windows 7). You may want to wait until the Dev Team at http://blog.iphone-dev.org/ releases their jailbreaking software.

To get started right now, go to purplera1n.com. Download it. Make sure you have windows(but not 7), the latest iTunes installed, and an iPhone 3GS with 3.0 firmware. Connect your iPhone normally. Click "make it ra1n". Wait. On bootup, run Freeze, the purplera1n installer app. Hopefully you'll figure out what to do from there. Best tutorial gets linked to from purplera1n site. This tool is beta. Make sure to have everything backed up before running. Also if Cydia doesn't show up after running Freeze, reboot.