Apple on Wednesday released iOS 4.1, the first major update to its mobile OS.

As Digital Arts reported from Apple’s preview at its 1 September media event, iOS 4.1 brings a handful of new features, key bug fixes, and performance improvements for iPhone 3G owners.

Major feature additions include high dynamic range (HDR) photos, Game Center, FaceTime calling from the Phone app’s Favorites tab, uploading full HD videos to MobileMe and YouTube over Wi-Fi, and support for TV shows rented from the iTunes Store.

Major bugs targeted in this release include a misfiring proximity sensor that could cause accidental hangups while on a call, as well as diminished audio quality when using Bluetooth accessories and Nike + iPod fixes. iPhone 3G owners can also look forward to better performance when using iOS 4.1.

Apple iPhone 4

Apple also patched a number of security holes in the update as well, including 20 vulnerabilities in the WebKit framework alone.

iOS 4.1 is a free update for the iPhone 4, iPhone 3GS, iPhone 3G, and second-generation iPod touch or later. The update varies in size, depending on your device, and is available now via iTunes when you connect your device to sync.