Verizon's Brandon Johnson demonstrated the most popular app: "Find my iPhone."
"Lets say you go out to dinner this evening," he said. "And someone steals the phone out of your car. You can go to any computer, type in your login, and provided the phone's turned on you can get a good idea where it's at."
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"Find my iPhone," which is free at the iTunes store, will even let you wipe your stolen phone remotely, removing all your contacts and credit card info.
The lost iPhone app will also let you display a message on it, saying "this iPhone has been lost: Please call me at the following number if you find it."
And you can also make it ring loudly, so that if it's in a trash can or under a bed you or someone else will hear it.