What is it: It's a great organized site you use to track your distances, workouts whether it be through swimming, running or biking. You can plot your route, and it has a great community built around the site. If anything it will inspire you do get some extra miles in.
You can join and use it for many different sport workouts such as spinning, weight lifting, cycle, cc skiing, walking, rock climbing, yoga, eliptical, cross training, rowing and others. It is a continual source of inspiration and helps keep me on track.
You can find it here: http://www.dailymile.com/
I'm "Pippin L" on there. http://www.dailymile.com/people/Pippin
Check it out.