iMap Weather have added winter weather and Snocountry information to their already comprehensive weather mapping service.
If you turn on the Skiing and Snowboarding layer on the map it is possible to quickly see which ski resorts have new snow, which are open and which are closed. Open ski resorts are shown with a green marker, those with new snow are shown by a blue marker and closed resorts are shown in red.
Clicking on a marker opens an information window with details of the number of runs and lifts open and also links to trail maps.
Maine's Snow Report
Maine's Snow Report is a Google Map that provides a quick guide to open ski resorts in Maine. Open ski resorts are shown with green map markers, closed resorts are shown in red.
Clicking on a map marker provides details of the number of lifts and trails open, as well as the current weather conditions.
Cross Country Skiing in the Finger Lakes
This Google My Map shows dozens of cross-country skiing spots across the Finger Lakes area in New York State. The map includes photos, prices, trail guides, websites and directions.
FlexMappers - This Flash based Google Map combines resort specific video, webcams, statistics, weather, blog and driving conditions by US state. Eventually the site will also include details of non-US ski resorts.
Ski Bonk - SkiBonk graphically displays snow depth and new snow for ski resorts throughout the world.
RiderTech - Ski resorts (and other action sports venues) from around the world.
RideSoCal - Southern California Snow Sports Community map. A Google Map mashing up the Ridesocal.com member database and ski resort information.
Ski Alberta Live - This cool Ski Resort mashup for the province of Alberta. With some of the best skiing in the world on offer, use this mashup to plot locations, find websites for all resorts and get driving directions.
Canadian Ski Resorts - Map of Canadian ski resorts, current news on the Canadian ski scene, stats for the hills and links to accommodations at resorts across Canada.
Wintersporters.nl - helps you find European ski destinations on Google Maps.