PERunCal

This app helps you manage a calendar/schedule of your upcoming running, biking and swimming events. It's perfect for runners and triathletes. Keep track of event names, dates, locations, distances etc. Can handle 5k's, 10k's, Half-marathons, Full Marathons, Duathlons, Triathlons, or just about any event type. Mark events that you've "registered for" vs. "planning on attending" vs. "just thinking about". When the event is over, you can record your time and placement results. Data can be backed up to DropBox, which also allows sharing of data with other devices. A free Windows app is also available for download, to allow you to access data from your PC.