You probably already carry your phone with you when you're on the course. Why not put it to work? The GolfLogix app--available for iOS, Android, BlackBerry, and Windows Phone 7 handsets--will give you an overview of the course, including the distance to the green. It will also keep score, and optionally it will connect you to the GolfLogix Member Clubhouse to track your games and connect with friends. The ad-supported app is free; you can choose to sign up for a year of membership in the Clubhouse for $20 annually, which will remove the ads and toss in a few more features.