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Recently Apple released the iOS 4.3.1. The iOS 4.3.1 is available for the GSM iPhone 4, iPhone 3GS, iPad 2, iPad, and the third- and fourth-generation iPod touch. The update doesn’t available for the CDMA iPhone for Verizon. The build has number 8G4 and contains the following improvements and bugs fixes:

• Fixes an occasional graphics glitch on iPod touch (4th generation);
• Resolves bugs related to activating and connecting to some cellular networks;
• Fixes image flicker when using Apple Digital AV Adapter with some TVs;
• Resolves an issue authenticating with some enterprise web services.

You can download iOS 4.3.1 here ^[2].