Yes Dev Team released the new PwnageTool 3.1.5 to Jailbreak iPhone (Edge/2G), iPhone 3G, iPhone 3GS(older bootrom only with baseband 04.26.08) and iPod touch (1G and 2G non-MC model; 2G should also be pre-jailbroken) running on iPhone firmware 3.1.3. This tool will help you to make Customize iPhone 3.1.3 Firmware version without updating [...]

Sn0wbreeze released the new and final version 1.4 to Jailbreak iPhone 3.1.3 Firmware. This will work on iPod Touch 1G, 2G and iPhone 2G, 3G, and 3G[S] (old bootrom & non MC). After the Jailbreak you can unlock your iPhjone with Ultrasn0w, Read the tutorial here to Unlock iPhone 3.1.3 Firmware. To Jailbreak iPhone OS [...]

Dev team Released the new PwnageTool 3.1.4 to Jailbreak for iPhone 2G/3G/3GS and iPod Touch 1G/2G. This one is only for MAC users. For best results, use the latest iTunes (9.0.1) — which includes a nice new application organizer. If you have the Legally Unlocked iphone and Want to Jailbreak the iPhone only than try [...]

Here is the tutorial which help you to Jialbreak your iPhone 3GS 3.1, but this is for Mac Users only not for the Windows Users. NOTE: PwnageTool will work for the iPhone 3GS if you have a jailbroken firmware 3.0 or 3.0.1. So read all the steps Carefully Before doing this. Note:- This one is [...]

Finally Dev Team released the new version 0f PwnageTool 3.1 (Mac) For Jailbreaking & Unlock iphone 3.1, this application supports the iPhone 1st Generation (2G), the iPhone 3G and the iPod touch 1G. NOTE: THIS DOES NOT SUPPORT THE 3GS OR 2G/3G IPOD TOUCH. redsn0w for Mac OS X and Windows will follow sometime in [...]