I bought the iskin duo case for the iPod touch 4g. Don't bother buying it. The case is more like skin, hence iskin, not really a case. It does have all the proper openings for everything but the touch is ALWAYS comes off. Whether I was taking off my coat, bending over to pick up something, getting into my car, etc.. the case was ALWAYS coming detached from the clip. The clip being still attached to my belt. So, I am constantly dropping the touch.
I would not bother with iskin. Look else where. Anyone disagree?