Using your phone's GPS, My Tracks allows you to display and record "tracks" - the path you take between when you start and stop recording. It's a great app for keeping track of your bike rides, jogs, walks, hikes, or even drive times. While recording and afterwards, you can view a graph of your altitude over time, or statistics on your average speed and time moving and standing still. You can upload your tracks to Google Maps to share them with friends, and your statistics can be uploaded to Google Documents into a spreadsheet. Each track allows you to declare what type of activity you were participating in, and when you upload to Google Docs you will have a different spreadsheet for each type of activity (and you can link the spreadsheet to a Google Map of your tracks). Overall, it's a very useful app for keeping track of how fast you ride your bike to work, which walk path is the fastest to get to the coffee shop, or just how far you've gone in the past week.