I know one thing I'd like to see is an app that uses the iPhone 3G's GPS to track your movements, and compute how far you've gone (not "as the crow flies"). This would be great for runners and hikers who want to see a map of where they've been (iwth their path hilighted and possibly with timecodes) as well as the total distance they've traveled (again with time codes so speed can be determined as well, if desired). I have yet to see anything even close to this, though most GPS devices have this ability. Does anyone know if this is under development somewhere? Any enterprising developer here want to create such an app, geared towards runners and hikers and such?