I was skiing at Silver Star Mountain (BC Canada) using Maemo Mapper, which downloads the OS tiles. The ski lifts were marked, and a couple of ski runs, and at higher resolution, most of the run names but not the runs themselves.

When I look with Merkaartor, I find that all the runs were added as undefined highway with "piste" attributes, but they are not being rendered to PNG tiles.

It would be nice if they were. Or is there some alternative tile URL where one can see different views into the database ? I haven't looked at how that happens, just uploaded a few roads and trails and magically they later appear :-)