I've been looking for a good, reliable GPS tracking system so that my friends, family and followers can watch my progress live as I cycle from Land's End to John O' Groats next month. I've begun trialling a system called 'InstaMapping' today. It works by using the GPS receiver on my iPhone and can be tracked on any PC or iPhone on my website. Click the following link for a preview of the Live Tracker. http://www.colindobsononline.com/Live%20Track.htm
The only drawback with this system is that is drains my iPhone battery flat in about four hours, but I'm trying to sort something out with that. If anyone knows of a better system for live GPS tracking, let me know.