1. Nike+ : This is part of the iPhone and you get it automatically when you purchase the iPhone (or iPod Touch). This app works with the Nike+ sensor (that you slot in your shoe) to provide accurate information of distance run. This app is ideal for running indoors on a treadmill, though it can also be used while running outdoors.
2. Nike+ GPS: This is a new paid app that was recently released. This works using the built-in GPS to track distance run. This is ideal for running outdoors where the GPS satellites can track your movement. My review of this app is here.
I mostly use the first application (Nike+) because I primarily run in the gym on treadmill. Up until now, I had to wait till I connect the iPhone to the computer and synchronize my runs to the Nike website using iTunes. The newer app (Nike+ GPS), on the other hand, has built-in sync that allows it to connect to the Nike server and upload the run data directly over a 3G or Wi-fi connection.
|Login to Nike server from the iPhone|
I entered my login credentials and I could see my run data and other statistics on the Nike server without ever going to the computer.
My iPhone is becoming better and better with each update.