On Tuesday, April 28 iPhone OS 3.0 beta 4 build 7A300g was released to developers enrolled in the iPhone Developer program. This release requires developers to download and install a prerelease version of iTunes 8.2. If you are a developer and you want to jailbreak your iPhone, iPhone 3G, or iPod Touch 1G you can now by downloading the jailbreak.

Note: iPhone 3G users, if you want to keep your yellowsn0w unlock then don’t use this. This is BETA firmware, you will definitely have problems and a lot of jailbroken app will not work with it yet. No support will be provided for this as this is a beta release. You can continue discussion of this in the iPhone OS 3.0 forum.

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Source: iPhoneApps.ru