Tethered jailbreak for iOS 5.1 available for original iPad, iPhone 4 via redsn0w 0.9.10b6

A tethered jailbreak for iOS 5.1 is now currently available for the original iPad and the iPhone 4, and earlier model iPhones. (If you have an iPhone 4S or iPad 2, don't attempt to update to iOS 5.1 and jailbreak, it won't work.)

Source: http://feedproxy.google.com/~r/TheIphoneBlog/~3/AuXeQVjnb0I/story01.htm

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