Just got back from a week of skiing in Verbier. Snow conditions weren't great so most of the time was spent on the upper slopes. My GPS (eTrex Venture) will only store 2048 points, so I had it set to record a point "least often" - I didn't take a computer with me to download the points to, so I got about 2.5 days' worth of data for the end of the week.

I've mapped the tracks I've got - lots of the upper lifts and pistes, including the black mogul run from Mont Fort (which I ended up doing in white-out conditions (!). I'll try and get tracks from one of the snowboarders in the group who was downloading the contents of his GPS every day, which should cover much more of the Verbier pistes, right down to the bottom of the Medran lift.

Sadly, Mapnik and Osma don't render pistes, although the chairlifts, gondolas and cablecars are rendered (is anyone rendering the pistes on another server? Maybe I should set one up...). I've tagged the tracks as proposed by http://wiki.openstreetmap.org/index.php/Proposed_features/Piste_Maps so drag lifts are marked as piste:lift rather than arielway.