If you are impatient and just can’t wait until Apple pushes iOS 5 out to the world on October 12th you can get the final release build now! Apple has put the final build out to developers, and because it is final you do not actually need to be a developer to install it on your phone.
All you need is the latest beta build of iTunes and the latest build of iOS 5. This is a stable release, and is the same one that everyone will be downloading in a few days, so it should not hurt your device in any way (at least no more than it would on October 12th).
Installing iOS 5 is easy. Simply download the correct build for your device from the bottom of this post. Make sure to save the file somewhere you can find it later. Lastly, perform a backup of your phone because it will be wiped clean after.
Open iTunes and Option click (Mac) or Shift click (PC) on the “restore” button. This will allow you to restore from a firmware of your choosing. Choose the iOS 5 build you downloaded and let the phone run though the process just like a normal restore.
After your phone reboots you will have the latest build of iOS 5 on your device. As I said before, this is an official build, so it is safe to install.
Download iOS 5 GM for iPhone 4 (GSM)
Download iOS 5 GM for iPhone 4 (CDMA)
Download iOS 5 GM for iPhone 3GS
Download iOS 5 GM for iPad 2 (Wi-Fi)
Download iOS 5 GM for iPad Wi-Fi + 3G (GSM)
Download iOS 5 GM for iPad Wi-Fi + 3G (CDMA)
Download iOS 5 GM for iPad 1
Download iOS 5 GM for iPod touch 4G
Download iOS 5 GM for iPod touch 3G
Download iTunes 10 Beta 7