Did you know that you could raise money for dozens of charities right now, for free? Charity Miles is a great mobile application that displays some ads when you start a workout in the app. By walking, running, or biking, you can cause the revenue generated by these ads to be donated to one of 45 different charities! The program has raised more than $2,750,000. Yes, two million, seven hundred fifty thousand U.S. dollars.