Ok i read up on this Jailbreaking stuff for the iPhone and at least understand why people do it. One article I read said that being able to tether your 3G phone to your laptop was the most frequent reason.
Some other people have posted that some of the new phones coming out have this feature already enabled and is a selling point for the phone.
I would think that eventually this may come to the iPhone?? I am getting a wifi only iPad so a phone that could do this for me would be higher up on the list than one that could not.