Viper's new iPhone app replaces your keychain

Car security company Directed Electronics is unveiling a new iPhone application Tuesday that lets customers control parts of their Viper SmartStart-enabled vehicle from their iPhone or iPod Touch.

The app, called Viper SmartStart, is quite similar toZipcar's recently released iPhone app, except it can work with your car, and not one you're renting for the weekend. It too creates a virtual keychain control module that can do things like lock and unlock your vehicle, open the trunk, and activate the alarm, getting rid of the need to carry around one of those keychain clickers as long as you've got your phone handy.

Coolest of all, though, there's a "Smart Start" button in the center of the screen that can turn on your vehicle. The company is promoting this as a simple way to defrost or cool off a car before you get in--that is, assuming you correctly set the climate controls the last time you were inside.

Since the app uses the iPhone's data connection to send the commands, you can control your car (or cars) from anywhere you have an EDGE or 3G signal. It also means you can use it on a non-cellular data device like the iPod Touch, as long as it's near Wi-Fi.