9 apps every business traveler needs now

If standing in line at the rental car counter is the bane of your business trips, then Silvercar may be your stylish escape ticket. The free Android and iPhone app lets you reserve a silver Audi A4 at a fixed price -- $89 on the weekdays and $59 on the weekends -- that's delivered to you via valet when you arrive at the airport. Use your smartphone to unlock the car and then plug in your playlist of choice.

When you return the vehicle, there's no waiting around for a person with a clipboard: The in-car technology records when it's returned and the fuel usage. The service is currently available at airports in Austin, Dallas, Houston, San Francisco, and will soon be in Los Angeles.

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