>iPhone 3GS (any 3GS, old or new bootrom!)
>iPod Touch 3G
>iPod Touch 4G
The only way Apple can fix this exploit is by making the devices with new chips inside! So...what does this mean?
If you plan to get an iPhone 4/iPod Touch 4G and want to jailbreak, NOW IS THE BEST TIME !!!
Soon Apple will release all new stock of iPhone 4 and iPod Touch 4G with new bootroms (like the 3GS) and jailbreaking will once again become a long and arduous wait after each update is released.
I'm not going to bother with a tutorial, as redmondpie has already done a bang up job of it, click here
Tested by a friend on the iPhone 4 and deemed successful!
As a reminder, once you successfully jailbreak and want to get apps for free, go to my tutorial posted here