The iPhone uses some type of hardened glass that is very resistant to scratching. Other people (not me) have tried to scratch it with keys and it just won't do it. Meanwhile I have an HTC G1 with glass that easily scratches and easily breaks. Its hard to break the glass on the iPhone. What does HTC use for these Nexus One like phones? (Nexus One, Desire, Incredible, etc). Are they likewise using hardened glass? If they use hardened glass, chances are you won't have any use for a screen protector.