timhibbard says:

Hey Chris (and other developers) - great site you got going here! One of my favorite things is the run comments, it really keeps me motivated to get positive feedback from other runners. I like to leave comments on other people's runs and it would be nice if I could be notified if somebody has also commented on a run that I've commented on...is that possible?

It would also be cool to see personal records and goals so that I never actually have to use nike+