As you know the Greenpois0n RC5, Redsn0w 0.9.7b7, JailbreakMe 3.0 are most rumored untethered jailbreak tool for iOS 4.2.1 iPhone 4, iPhone 3G, iPad, iPod touch. The Greenpois0n RC5 and Redsn0w 0.9.7b7 are sure to release when ready. However, the jailbreakMe 3.0 is still confirmed whether to release or not by comex. Comex is likely to release a untetherd jailbreak iOS 4.2.1, but the new tool may not be jailbreakMe 3.0.
You need no more wait for windows redsn0w 0.9.7b5. The redsn0w 0.9.7b5 will be release two days later. Now the iPhone Dev Team is working on the speed problem.
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