QuickPWN for iPhone 3.0 Beta 2 is out and available for download. This piece of software is not developed by iPhone Dev Team and does not claim to be the official release of the hack. Author at QuickPWN claims that the software works on iPod Touch with firmware 3.0 beta 2 and similarly will work on iPhone as well.
This software works with the RiPDev’s Icy App to complete the jailbreak process.
I know there are quite a few developers and even users who are eagerly waiting to jailbreak their newly installed iPhone OS 3.0. This is your best bet.
On the other hand the official iPhone dev team suggested users not to use the unofficial QuickPWN softwares to jailbreak their iPhones as it will kill yellowsn0w forever which makes it impossible to software-unlock your iPhone 3G [link]