We have released a skiing app for Windows Phone 8 devices (Its the Win8 port of our Android app. Its the #1 ski app on Android).
We do support Angefire,NM.
Its the only app to use GPS accurate ski resort data. The app can accurately split your ski track into lifts and runs, accurately identifying the names of the lifts you have taken, and provide ski stats on a per run basis (in addition to aggregate stats).