WARNING: Try this under your own risk.
iOS 5.1.1 jailbreak, available now.
Pod2g has released Absinthe 2.0, a jailbreak for iOS 5.1.1 and it unlocks:
iPad 1
iPad 2 (Wi-Fi/CDMA/GSM)
iPad 3 (Wi-Fi/CDMA/Global)
iPhone 4S
iPhone 4 (GSM/CDMA)
iPhone 3GS
iPod 4G
You can download it here and do not use if you have issues of baseband.