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If you unroot you can. Get z4root in the market to root. One click will do it, and you can also one click to unroot with it.
I used z4root and chose the perminant root. There were two options. Does this mean I will not be able to unroot?
There isI haven't used z4root, but I would expect it has an unroot option. Have you looked to see if that is the case?
Really, there's no reason to unroot short of having to take the phone back to T-Mobile. Leaving it rooted won't hurt anything. If all else fails you can use Odin to get the phone back to factory stock.