I made some mods to my bicycle reporting dashboard last night and just pushed them live. Highlights include being able to break down the charts by bike, route, or day of week, legends to support showing multiple series, control over the chart baseline (zero or autodetect), and formatting of the "elapsed time" axis labels.
Now that that's working right, multiuser is next on the list, and I'll probably throw a "route link" field in there as well so you can link to a map of your route if you have one.
What an awesome idea! Nice work!