Few days back Pod2g posted in his blog that his iOS 5.1.1 Untethered Jailbreak will not work on iPhone 3GS, AppleTV 3 and iPod Touch 3G.However, he has now confirmed via his tweet that iPhone 3GS and the iPod Touch 3G will also be compatible with his jailbreak.

Good news. We’ve found a way through for iPod 3G and iPhone 3Gs users. Upcoming jailbreak will be compatible.
Pod2g has confirmed that his untethered jailbreak works on the following iOS devices-
iPhone 4
iPhone 4S
iPad 1
iPad 2 Wifi
iPad 3 Wifi
iPad 3 CDMA
iPod 3G
iPod 4G
The list of devices that will not be supported -
AppleTV 3
The list of devices which will be supported most probably-
iPhone 3GS
iPad 2 (GSM/CDMA/Wi-Fi R2)
iPad 3 Global
Apple TV 2G
Pod2g will be releasing iOS 5.1.1 Untethered Jailbreak in a couple of weeks.