This thread is great. I had seen demos with many of these cool features already, but I did manage to read up on a few gems that I didn't previously know about. Thanks to everyone that has contributed.
Gorilla Glass is nice, but not impervious to scratches or cracks. My wifes Samsung Infuse (also Gorilla Glass) has a few small scratches, and my Father's GSII got a nice spider web across the screen from leaning over SGP Ultra Crystal Screen protector if you are looking for something that looks and feels like glass. No rubber feeling to it like some skins, and as the product name states, they are crystal clear so there is absolutely no screen distortion.
I have used Zagg, BodyGaurdz, Skinomi, etc, but I always go back to SGP Ultra series protectors because of how they feel, and protect the screen. Not to mention, it is a dry install, no water or spray to mess with and no bubbles. Once installed you forget it is there, and still have added protection for the screen.
I ordered mine from Amazon for $13, and installed it as soon as it came out of the box at the Store. Works great.