We saw a preview of iOS 4.3.1 a couple days ago and news of its imminent release to fix security holes. Apple has now released iOS 4.3.1 for download.

This update addresses the following:

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

Direct download links below:

• iPhone 4 (GSM)
• iPhone 3GS
• iPad
• iPad 2 WiFi
• iPad 2 GSM
• iPad 2 CDMA
• iPod touch 4G
• iPod touch 3G

The update is available in iTunes. As always, do not update if you want to preserve your jailbreak.