A few days ago, a untethered jailbreak for iOS 4.2.1 has been released. This will allow you to fully jailbreak your iPhone, iPad and iPod touch that is on iOS 4.2.1. The jailbreak for the Apple TV 2G will be released soon as version RC6. As of right now, the jailbreak is available for Mac and Windows operating system. Hope you have fun jailbreaking and installing Cydia apps. :) The jailbreak is called GreenPois0n and is available here.
Talking about jailbreaking iPhones and iPod touches. Did you know that there are styluses out there for your iOS devices? It is a great tool to prevent fingerprints on your screen. It's really cool and cheap! Check out these great deals!