iOS 4.3.3 8J2 has been released by Apple for iPhone 4, iPhone 3GS, iPad 2, iPad and iPod touch and you can direct download from links below. Simply connect your device to the computer via USB and update to iOS 4.3.3 with iTunes 10.2.2
Download iPhone 4 (GSM) 4.3.3_8j2_Restore.ipsw
Download iPhone 3GS 4.3.3_8j2_Restore.ipsw
Download iPad 2 WiFi 4.3.3_8j2_Restore.ipsw
Download iPad 2 GSM 4.3.3_8j2_Restore.ipsw
Download iPad 2 CDMA 4.3.3_8j2_Restore.ipsw
Download iPad 4.3.3_8j2_Restore.ipsw
Download iPod touch 3G 4.3.3_8j2_Restore.ipsw
Download iPod touch 4G 4.3.3_8j2_Restore.ipsw