iPhone OS 3 iOS hero

If you need a past or present iPhone, iPad, iPod touch, or Apple TV iOS 3 (previously iPhone OS 3) firmware file, we've got 'em all here. Just browse to the device you want and click the firmware file you need. Your download should automatically start. All downloads are the official Apple firmware release versions.

iPhone 3GS

iPhone 3G

iPhone

iPod touch (3G)

iPad

Source: Apple.com