Redsn0w 0.9.8 beta 3 update is out there to jailbreak iOS 4.3.4 for iDevices including iPhone 4, iPhone 3GS, iPod Touch 4, iPod Touch 3G and iPad 1.
The iPad 2 is not supported by Redsn0w 0.9.8 beta 3, so users of iPad 2 who want to maintain their jailbreak should stay away from iOS 4.3.4 update.
Redsn0w 0.9.8 beta 3 for iOS 4.3.4 works for Mac and Windows, which could be downloaded via integrated links.
Download Redsn0w 0.9.8 Beta 3 for Mac
Download Redsn0w 0.9.8 Beta 3 for Windows