I checked out the site, and while I like its idea, I find it very poor in content, organization, and options.
What I have in mind is similar to it, but extended to the following:
-tracks, wapoints, routes downloadable in various formats
-tracks etc. are organized by and searchable by various properties
-descriptions/photographs for tracks etc.
-when multiple people upload similar tracks, a "master" track is formed
-visitors could rate the tracks etc.
-tracks etc. could be seen visually on a map.
-tracks etc. are not for only hiking, but waterways (rafting, boat trips), motoscross tours, even flight trips (for balloons, RC flights etc.)
-and a lot more
-and of course, it would be priarily for Greece.
At the moment I am looking for ideas. And a bit later, I might start implementing it if I see there is enough interest/demand for it.
vitya