Hi pchew, glad to hear that Map My Tracks works for you. We have plans to include a trail of your track on the phone in future releases. You might be interested in trying out the version that we have just released that allows you to track without showing any map at all.
Version 1.2.1 allows you to simply track without any map. This helps to keep your data charges down as the map tiles make up the most data transferred when tracking. Version 1.2.1 can be downloaded via your phone’s browser at http://www.mapmytracks.com/install
I hope that helps.