VehiCal (, free): Particularly useful for business travelers who spend a lot of time behind the wheel, this car expense management app calculates and keeps track of all vehicle-related information and expenses, such as fuel consumption, tolls, parking, mileage, and more. You can create custom categories and save data in CSV or HTML format to send to the bean-counters at the office.

iWrecked ( and , free): Here's hoping you'll never actually need this app--but if you do, it might help make a frightening situation just a little less stressful. If you're involved in an accident, use it to log all the details, including insurance information. Take unlimited photos of the damage and the scene and send a detailed PDF report directly to your insurance company. The app also includes emergency contact numbers and resources for taxis and towing.

Trapster ( and , free): Have a lead foot? Trapster could save you from your next speeding ticket. Sign up, and this app will alert you to speed traps, hidden speed cameras, accidents, and other potential road hazards. It'll also let you know when the speed limit changes and you're going too fast. Annoying? Maybe, but you'll be safer--and richer--for it.

And one more we must mention:

GasBuddy ( and , free): This app helps you find the gas station with the lowest prices in town.