Engadget
The Dev-Team Blog was just updated with a new redsn0w version 0.9.6b4 jailbreak (based on Geohot's Limera1n bootrom exploit) for iOS 4.2.1.
- How to jailbreak your iOS 4.2 device - PalmAddicts
- iOS 4.2.1 Tethered Jailbreak Available, We Suggest Waiting - MacStories
- RedSn0w 0.9.6 Download Problems: Jailbreak iOS 4.2.1 - Phones Review