Any good leg stretches?

lunges, thiegh thrust, penis wipes, vagina high fives that sorta shit

just stretch the shit out of your hamstrings and groin and you will be set and if you dont know how to stretch for these you are a retard.

yea, and it's a little late to start workin on flexibility for this season. Still do em. But just lettin' you know.  you won't feel a difference for a while.

just stretch every night. hamstrings, quads, groin, glutes. all those muscles need to be stretched and you will feel absolutely awesome in a month.

also even though you are asking for leg stuff you should also do some core body exercises because that is important in all sports including skiing.

read the november(?)(c.r johnson come back) powder magazine
there some good stretched in there

Here's just a few off the top of my head but for legs you may want to try Squats (barbell or with exercise ball wall squats with dumbells), Leg Press, Step Ups, Lunges, (those are compound movements) Hamstring Curls, and Quadracep Extension, Calf raises (isolation exercises)

For stretching I could continue writing for ever or I could give you this link, it is a great stretching guide for any muscle group you want, complete with pictures and video.  check it!
http://www.bodybuilding.com/fun/stretches.htm 

with a solid and consistent strength training and stretching routine, you will not only feel better and perform better on the mountain, but you will greatly, I repeat GREATLY reduce your risk of injury.
Hope this helps!