I originally downlaoded NST when it first appeared in Beta Labs many moons ago. I have really started using it in ernest for just over a month a I have started running again after only 10-15 years off.
Love the app. There are a number of improvemnts that could be made and a number of issues that could be solved.
The ability to compare workouts and review improvements.
Providing feedback from the software during workouts.
Audible distance markers identifying how far you've gone rather than single beep.
Audible Distance v. time feedback during workout
I have found an issue with the GPS reception when music is playing through Nokia Music Player and NSt is running with 500m laps.
Although there as these improvement capabilities and issues I Love this software.
Also love the lesser known fact that if your phone dies part way through a workout NST will recove the workout file and be able to log your progress up until the power-off.