It's an iPhone App - Cyclemeter.
I used to use Strava, but this one is great as I needed a programable timer with alarms.
You can set up your training sessions on a calendar - interval sessions, timed sessions, distance sessions. You press go and put it in your camelbak with head phones on (I'm currently looking for a good set of waterproof headphones - blue tooth would be optimal!)
You set it to get updates every 1minute or whatever and it will tell you your speed, time left on your interval and heart rate (Polar have just brought out a bluetooth tansmitter that pairs with this App). At the end you get a map of your run and statistics on average speed and heartrate, which is graphed along with your total time or distance. Really useful for seeing where your workload increases or falls alway during an interval.
No need to mount a GPS on your board and try to see it - especially during these cold dark mornings we have here at present!
