DinoZambas (@DinoD7) has uploaded a video-tutorial of Sn0wbreeze 2.3b1 which can help you to jailbreak iOS 4.3 on iPhone 4/3GS, iPod Touch 4G/3G & iPad. Except iPhone 3GS (Old Bootrom), it will be a tethered jailbreak for all iDevices. To boot your iDevice into tethered jailbroken state after iOS 4.3 custom IPSW restore, you have to use iBooty 2.0. The video tutorial below also shows how to use iBooty to boot-up your iDevice into tethered jailbroken state.
Note that the above video guide is only for Windows users only. To jailbreak iOS 4.3 on Mac, you can use PwnageTool bundles. iOS 4.3 PwnageTool bundles are created by two hackers i-e iH8sn0w (@iH8sn0w) and DjayB6 (@DjayB6). The bundles of iH8sn0w do not require you to patch Ramdisk using Universal Ramdisk Fixer while creating iOS 4.3 custom IPSW. So, i will recommend you to use PT bundles by iH8sn0w. You can download these bundles for iPhone 4, iPhone 3GS (New Bootrom), iPhone 3GS (Old Bootrom), iPad and iPod Touch 4G/3G from here.