iPod Touch 3G – iPod3,1_4.3.4_8K2_Restore.ipsw
iPod Touch 4G – iPod4,1_4.3.4_8K2_Restore.ipsw

iPad 3G/WiFi – iPad1,1_4.3.4_8K2_Restore.ipsw
iPad 2 WiFi – iPad2,1_4.3.4_8K2_Restore.ipsw
iPad 2 GSM – iPad2,2_4.3.4_8K2_Restore.ipsw
iPad 2 CDMA – iPad2,3_4.3.4_8K2_Restore.ipsw

iPhone 3GS – iPhone2,1_4.3.4_8K2_Restore.ipsw
iPhone 4 – iPhone3,1_4.3.4_8K2_Restore.ipsw
iPhone 4 CDMA – iPhone3,3_4.2.9_8E501_Restore.ipsw

With this version, Apple has only patched the PDF exploit used by jailbreakme.com 3.0. Though it is a remotely exploitable security issue, another major reason for issuing this update is to stop jailbreakers. They’ve already released a tethered jailbreak for 4.3.4, but there’s not really any point to doing it. 4.3.3 + jailbreakme.com + Cydia’s PDF Patcher 2 will get you an untethered jailbreak with the PDF exploit patched. As always, unlockers should be especially careful with new iOS versions and baseband upgrades.