Here's something fun I stumbled across: the National Avalanche Center's Interactive Backcountry Tour. You are given a brief itinerary and sent off into the wild, where you will face a variety of choices in changing conditions.
The interactive-ski-tour idea isn't quite as developed as it could be, but if you're desk-bound, it's still a good way to kill a few minutes. And hey, maybe you'll even learn something.
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