The new greenpoisOn jailbreaking, RC5.4 tool can apparently be used to jailbreak the iphone 4, Verzon iPhone 4 and the iPad 2 says the developers team of greenpoisOn. This new untethered jailbreaking tool is the successor to iOS 4.2.1 jailbreaking tool that was developed by the same team. The earlier jailbreaking tool was able to jailbreak the iPhone 3G and iPhone 4 along with the first iPad and the third generation iPod Touch. When compared to the Pwnage tool which was also released a couple of days ago, this RC5.4 is untethered and has also been tested on the new Verizon iPhone 4.2.6 iOS update and it has worked successfully.
Also, this greenpoisOn tool is comes for all the platforms viz. Mac, Windows and Linux, thus allowing the users of any operating system to jailbreak their phones.