I've come to the conclusion that despite childhood fantasies, I will never be passionate or self-loathing enough to run a marathon. However, I could track a friend via SMS.
This Sunday, the Dallas White Rock Marathon will implement a pretty cool feature for participants and their friends/families. While most modern marathons track runners with (RFID?) chips attached to their shoes, this marathon in Dallas will take that data and send it out, texting or emailing split times and finishing results to anyone who registers with a particular runner.