First Jailbreak for iOS 4.3 SDK. Unofficial PwnageTool bundle has just been released to jailbreak the newly released iOS 4.3 beta 1. PwnageTool bundle is only compatible with iPhone 4 only, all other devices are not currently supported.
Download PwnageTool bundle
Download iOS 4.3 beta 1
Download iTunes 10.1.1
Disclaimer: This guide is for testing & educational purposes only and didn't tested yet. This version of PwnageTool not issued by dev-team.