MTB mapping website

Stumbled across the Connecticut MTB community website - Crankfire - which is providing an online web-mapping service for MTB tracks. They also have a page about how they are using Google Earth. You can see a sample map here. It sounds as though they are wanting to branch outside of just Connecticut now - I wonder if they can handle Southern Hemisphere co-ordinates?

Interestingly, they are using a php mapping script called JJFMapper - which we might have to keep an eye on.