Originally posted by lemon boy
http://www.avalanche.org/~uac/encyclopedia/

Dave- you'll especially enjoy all of the topics on snow types and metamorphism there's some really neat stuff in there. Probably no better/easily accessible snow science primer around.

and I may have shared it with you before but the USNs sunrise/sunset (point!) tables are great:
http://aa.usno.navy.mil/data/docs/RS_OneDay.html
The Alaska Railroad has been fighting slides all winter. They had a "perfect" mix of early weather to create unstable snowpacks that will last until summer.

I wish them luck.