iPhone OS 4 has been released as is named iOS 4 by Apple at WWDC 2010. The new OS has lots of new features including multitasking, app folders among many others. For complete features, head over to this post: iPhone iOS 4 features.
Remember that it is a developer release so your iDevices UDID needs to be registered with Apple. Below are the direct download links to iOS 4 ( or iPhone OS 4):
iPhone 3GS: Download
iPhone 3G: Download
iPod Touch 2G: Download
iPod Touch 3G: Download
Enjoy 🙂
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