The Dev Team released redsn0w version 0.9.12b2 on Friday. The update fixes the iPhone 3GS iBooks issue, and gives users a rocky-racoon injection option.
From the Dev Team's website:
"Update #1: 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.”
iPhone 4 and 4S owners will not want to re-jailbreak using redsn0w v.0.9.12b2 since it does not offer anything useful for those devices. iPhone 3GS users experiencing the iBooks bug can download the new version from the Dev Team's website.