They used to output KMZ data for Google Earth, but I couldn't find it now. It was pretty nice for a early Sierra trip I had planned last year. Accuracy is questionable, and resolution is poor (passes that were supposed to have 10'+ of snow pack were snow free on the ridge-line), but better than nothing, I suppose.
From the same site:
The "animate last two weeks" feature is nice to see trends. Again, this data is questionable.