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I don't have one and never will, but it looks like it has been jailbroken, but they can't release the software to the public because it contains some of apples code, and well they have enough trouble with apple as it is w/o swiping their code :P
http://funadvice.com/r/3k6o7v318f
The iphone os 4 can be jailbroken...but, I'm not sure about the iphone 4 hardware itself (my wife put the iphone 4 operating system on her iphone 3g).