Apple has released iOS 4.3 for the iPhone 3GS, iPhone 4, third- and fourth-generation iPod touch, and iPad ahead of its scheduled date of March 11. The update includes a number of new features, such as improved Safari performance, improved support for AirPlay video and audio from third-party apps and Safari, the ability to customize the iPad switch for mute or orientation lock, Personal Hotspot cellular data sharing for the GSM iPhone 4, and iTunes Home Sharing, which allows users to wirelessly stream content from iTunes to an iPad, iPhone or iPod touch over their home network. iOS 4.3 is available now via the Update feature in iTunes.