The greenpois0n iPhone iOS 4.1 jailbreak is still not out yet. Many users are demanding updates on the greenpois0n software. While the Chronic Dev Team, the makers of greenpois0n haven't announced any ETA, a Twitter user Veence tweeted saying that the Chronic Dev Team won't wait until the iOS 4.2 release to release greenpois0n, and greenpois0n will be released for iOS 4.1 soon.
iOS 4.2 is due to be released in November, so you can expect greenpois0n to be released before then. In the mean time iPhone and iPod touch users are advised to avoid fake greenpois0n websites claiming to have the greenpois0n download. You can follow @QuickPWN on Twitter for instant updates.
If you want to jailbreak iOS 4.1, please do not keep asking the creators of greenpois0n software for updates as it's difficult for them to give any estimate on how long it will take to release greenpois0n. Let the greenpois0n creators be productive and finish their work. The greenpois0n download will eventually be available soon.