i used to do the program "Air Alert III" i think it was called but i had to stop cause i got achilles tendonitis.  not from the excercises it was just from other stuff.
at 5'8" in 8th grade I was already able to dunk with strong hand off strong leg, but after like a little over a month on the program i prob gained maybe 2" vertical which helped a lot.  it also helps with explosion in sprints and just general quickness and responsiveness.
definately a good idea to look into not only for skiing, but just for general sports.  the workouts were more fun for me than any other stuff really cause it was different excericses than i had ever done before, and i could really get into them.  i'll try to find the link, otherwise just try searching around for "Air Alert 3."