The boys of summer are about to step up to bat, and you'll be able to follow every play anywhere you go with the MLB.com At Bat 2009 iPhone app ($10). The app tracks the type, speed, and location of every pitch. You can choose live, streaming audio from either the home or visiting team, or watch video of best plays seconds after they happen. The app also provides game and standings updates as they happen. Best of all, the app automatically detects your connection speed and scales its streaming speed to deliver the best video for your situation.