The Rocky Racoon 5.1.1 Untether was just updated to version 1.0-2, and is now available for download in Cydia. This is the package that is installed on iOS devices that utilize the 5.1.1 untethered jailbreak, whether you obtained it via Absinthe, or via the Rocky Racoon installation on a 5.1.1 tethered jailbreak.
This update brings support to the iPhone 4 (GSM) 5.1.1/9B208 build that was recently released by Apple.