Apple has just released the iOS 4.1 Gold Master Candidate (build 8B117) along with SDK for iPhone, iPod touch and iPad and is available for download. If you have a membership of the iPhone Developer Standard or Enterprise Program, you can download iOS 4.1 GM firmware for iPhone 3G, 3GS, iPod Touch 2G and iPod Touch 3G now! Recall that GM (Gold Master) is a version that can be considered equal to the final.
iOS 4.1 GM Change Log
iOS 4.1 GM contains fix for Proximity sensor, Bluetooth bugs, iPhone 3G bugs along with new eye popping functions like HDR photos (High dynamic range photos). HD video upload over WiFi, TV show rentals, and Game Center. If you want to install iOS 4.1 GM firmware on your iPhone then use the following link to download iPhone OS 4.1 firmware.
Download iOS 4.1 Gold Master firmware
Note:You NEED to register your device ID with a Dev Account to use it.