As expected, Apple today released iOS 4.1 for the iPhone 3G, iPhone 3GS, iPhone 4, second-, third-, and fourth-generation iPod touch. The update brings a number of bug fixes and new features, including a fix for the iPhone 4’s proximity sensor, Bluetooth issues, and performance problems on the iPhone 3G. Notably, the iPhone 3G is left out amongst its iOS 4.1-capable peers in support for Apple’s new Game Center social gaming service, which is also included in the update, along with support for High Dynamic Range (HDR) photography on the iPhone 4 (a comparison shot appears below), HD video uploading over Wi-Fi, and support for TV show rentals from the iTunes Store. iOS 4.1 is available now as a free upgrade for all compatible devices via the update feature in iTunes; for more information on iOS 4.1, see our Instant Expert article.