The iPhone Dev Team has released RedSn0w 0.9.12b2 to do untethered jailbreak iOS 5.1.1 over iPhone, iPod Touch and iPad.
With some other improvements, latest RedSn0w also gives option to restore their activation tickets SAM unlockers, that allowed them to restore their activation tickets, and other improvements.
According to official blog:
Starting with version 0.9.12b2, redsn0w will now explicitly ask users with limera1n-able devices whether they want to inject rocky-racoon using the DFU ramdisk method or the backup/restore method (the ramdisk method is better for those with lots of media on their device that would create very large backups, and it’s required for those with unactivated iPhones). If you’ll always want to use limera1n, you can select that in the Preferences pane. It also fixes an iBooks issue on old-bootrom 3GS iPhones, and provides more useful error messages when things go wrong.