I love shooting with a touch screen! Problem is eventually the screen is going to get scratched. The best screen protector is the Pro Guard. I use them on all my cameras. The Pro Guard comes with two screen protectors and what some call the best cleaning cloth available today.
Already using a Pro Guard? Let me know what you think about it in the comments below. I really feel this is the best on the market but if its not I want to know. Happy shooting!