I use RunKeeper and my phone's GPS to track my outdoor activities that cover any sort of distance. Tonight I initiated the tracking about a fifth of a mile into my walk and wanted to edit the data afterward to include the complete walk. After uploading the data to RunKeeper, I downloaded it in KML form on my Mac. Next, I used the RunKeeper website to create and download another KML file containing the missing segment. GpsPrune made it easy to merge the two KML files and export as one. Finally, I wanted to upload the data back to RunKeeper, but it only accepts GPX or TCX files when uploading. KML2GPX saved the day with a quick conversion, and now my track is live.