In Pictures: 15 coolest gadgets at Macworld/iWorld Expo

The Macworld | iWorld Expo in San Francisco is an Apple lover's Disneyland. Ashton Kutcher kicked things off by plugging his movie "iJobs," but the main attraction is the showroom floor where vendors display their wares, everything from iPad and iPhone add-ons to iOS apps to Apple enterprise gear.

Nitro Glass

Riding on the BART train to San Francisco, I saw a dozen people with iPhones -- a third of them had shattered screens. It's a big problem, especially with the iPhone 4 and iPhone 4S, which have glass on both the front and back. But a solution is on the Macworld | iWorld show floor, called Nitro Glass. It's a tempered glass screen protector that's hammer tested; salespeople were banging iPhones on the table with no ill effects. Cost: $40.

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