Two people have asked how to delete individual trips, so I thought that would make a great choice for a new blog entry. Simply edit the trip you wish to delete and scroll to the bottom. There is a large, red, "Delete Trip" button at the bottom. Press that and another "Delete Trip"/"Cancel" screen appears for confirmation. Press "Delete Trip" to confirm and your trip is gone!
To delete ALL your trips, just press the garbage can icon at the top left of the Trips List. You will have to confirm it, but remember it cannot be undone! I recommend emailing yourself a report of all your data first, but this is a great way to start fresh each month, quarter, year, or whenever you want.