iPhone 4S might not be on shelves until Friday, but iOS 5 greets the world with a big HELLO! And in case you missed the commotion, you can now download the new OS! But before you freak out, be sure to back up all your iPhone essentials like apps, music, contacts, etc! And once iOS 5 successfully boots up into your system, sync your device right away!
The latest OS is compatible with iPhone 3GS, iPhone 4, iPhone 4S, iPod Touch 3G, iPod Touch 4G, iPad, iPad2 and Apple TV 4.4.
Here are the direct links with your respective device. But before you do the clicking, be sure that you download the latest itunes version here.