Many users were anticipated as when the greenpois0n will announce the date for iPhone and iPod touch users who want to jailbreak iOS 4.1. The users are eagerly waiting for it to be released and finally, pod2g, the one who made the SHAtter jailbreak exploit reveal by making a tweet saying that the greenpois0n download will be released in days.
The greenpois0n jailbreak software uses the SHAtter exploit to jailbreak iPhone, iPad, and iPod touch on iOS 4.1 firmware. It is an easy to use GUI which will be available for Windows, Mac, and Linux.
For now, if you want to unlock your device then you must wait for another tool to be released.