iOS 5.1 gets tethered jailbreak for non-A5 iPads, iPhones and iPods
 

We've got good news for anyone intrigued by the new (largely incremental) features of Apple's latest mobile OS update. MuscleNerd, famed iOS meddler, has confirmed that iOS 5.1 can be jailbroken to the original iPad, iPhone 4 and 3rd and 4th generation iPod Touch devices. Unfortunately, it's still a tethered jailbreak which means you'll need to "just boot" the device using redsn0w whenever it powers down. However, we're sure those iOS hackers are already working on that minor niggle. Get the full instructions and those ever-important warnings over at Think iOS, which also links to the required iOS 5.1 files.

http://www.engadget.com/2012/03/08/i...k-ipad-iphone/