never heard of something like this or an app that does that, what I know is that the new mac os mountain lion that was recently announced by apple comes with imessages for mac, probably from there maybe you could print it, or take screen shots, I doubt it that theres an app that can see your text messages, apple would never allow this, because it would also be known as a spyware, other people could read your messages, but if your iPhone is jailbroken, then theres probably an app for that in the cydia store
