Having been an athlete in high school, Id lost that part of my life until I decided to do the Iron Girl Tri last summer. I had a year to train and I found that having a plan in front of me everyday gave me a good base to work from.
It worked too! I completed Iron Girl in August and will be taking on a couple Olympic distance events in 2011.
The app could be a little more elegant in its interface, but functionally its great!
iBit about First Time Triathlon