Update : The latest version of Redsn0w (Windows) can enable that tricky DFU mode on Windows! Macs can use the Pwnage tool to create the custom firmware itself…
Warning : This isn’t for the faint of heart. I did not post a detailed writeup cos’ DFU mode is kinda tricky on this one. If you know what this is and what it means, go ahead and try this. All others, please wait while other Windows users verify this.

The links are all interchangeable and you have all the mirrors you can ever think …

Geohot failed to release it, but comex did. Here is the full guide.
Geohot did it again, this time with a nice video-proof. Apple’s heightened security with the latest bootrom in ipt2,3 and 3GS iPhones forced many to resort to tethered jailbreak which can be a pain when your iPhone decides to reboot on the go. A blackra1n like app should soon see the light of day for total freedom to all Apple mobile gadgets! Till then, check geohot’s post.

Geohot first released the 3GS Jailbreak solution and the Dev Team, who initially planned on releasing their version of the Jailbreak after Apple released iPhone 3.1 firmware had no other choice but to release it immediately! Dev Team’s redsn0w handles the jailbreak for your iPhone 3GS more like the 3G and 2G variations.

Download redsn0w using the following links :
redsn0w for Mac OS X
redsn0w for Windows
redsn0w for Linux (introducing!)
Click here for a simple and quick guide to get you up and running with this revolutionary iPhone 3GS jailbreak. Don’t hesitate …

Apple gifted all iPhone 3GS owners with an exploit so that we can jailbreak and unlock our iPhone 3GS to our heart’s content. But here is the catch! The exploits WILL be closed in the next firmware upgrade which is due any minute now.
So here is the thing : PLEASE DO NOT UPGRADE TO iPHONE 3.1 before performing the following procedure (if you want to unlock/jailbreak that is!). Dev Team is waiting for the next release (iPhone 3.1) so that the Apple will not close the jailbreak exploit. Jailbreak for …

Redsn0w is a revolutionary way to jailbreak, activate, unlock an array of Apple’s devices based on iPhone 3.0 firmware. Devices like iPhone 2G, iPhone 3G, iPhone 3GS, iPod Touch 1G/2G can easily be jailbroken, activated and unlocked (iPhone 2G – Automatic, iPhone 3G – Manually via Cydia & Ultrasn0w).
If you don’t want to go through the following steps and you just want the real deal, follow this guide rather wherein you can download the custom firmware file which should do the job for you!
The tool itself is so neatly packaged …