After a long wait , the chronic dev team has released their Greenpois0n untethered jailbreak for almost all iphone models running on version 4.2.1 , Apple TV and Ipad.
The first release of greenpois0n RC5 was launched for Mac OS which had couple of issues.However, they released a version for windows today ( RC5 b2 ) and Mac OS ( RC5 b3 ) which seems to work just fine.
Following are the url's where you can download it from :
For Windows : http://www.iphone-hacks.com/iphone-downloads/file/305
For Mac OS : http://www.iphone-hacks.com/iphone-downloads/file/306
The procedure is pretty simple. Just follow the instructions to boot the device in DFU mode and click Jailbreak button.
The best thing i like about this jailbreak is that unlike Redsn0w , you dont have to worry about your SHSH blobs on Cydia server.
