I'd like to be able to find people or routes that are near my running routes. I'd also like to find popular running routes when I travel to a new city.

It would be cool to run virtual races. Either on the same course at different times (loop central park, for example) or different courses on the same weekend (10K, for example)

Compare my workout stats to people in my area and age group

Let me see stats with units in metric

Tell me how I measure up overall, not just per workout

My desktop training software supports emailing a workout. I want to be able to email my workouts to ZED9 to get them into my account.

Post as me on Twitter when I upload a workout.
How about when I get an achievement too?

Have different icon colors for within the same sport. This would show, at a glance, what sport you've been doing and not have to mouse to it for that info.

This would allow you to skip the middle step of exporting to a .gpx file.

Let me set up time-limited challenges (public or limited to specific users).

I want to follow people (like Twitter) so I can easily get updates on their activities.

Groups should have their own page with leader boards and recent public workouts just for members of the group.

For workouts with GPS data, map all of my starting points

http://www.zednine.com/workouts/666

This was run for 7 minutes, turn gps device off for an hour, run for 13 minutes. The interpretation of the file makes up date in the middle, and vastly over-estimates things like calories....

Show me how much time I spent in each of my HR zones both for a specific workout, as well as in aggregate for a period of time.