Scratch proof patented nano memory technology brings the protection for iPhone at the level of the protection of helicopter blades against dirt, dust and stratches. It is the most durable and toughest protection for iPhones. I suggest watching the video at their websites to see the protection level.
Zagg also provides protection for other tech gadgets including cell phones, digital cameras, gaming devices, iPods, GPSs, laptops, mp3 players, pdas and even for watches.
Protect your iPhone 3G from Scratches - Get the invisibleSHIELD.