In reply to wbo:
Lots of people have died and disappeared(presumed in some cases to have ended up in crevasses,others confirmed as such) on Denali due to crevasses.Read Jonathan Waterman's book Surviving Denali.
Having been lowered into a crevasse in the Cascades in the past,I would not like to end up even in a small one.
Admittedly I did fall into one coming down to 14,000ft camp on the West Buttress route,but not an over the head event.I was in the middle of a rope and actually climbed out myself before anyone else was needed to help me.It is the over the head fall which is the real worry.
I too am impressed with the skis.Read the brief article on the Alpinist web site and you will be interested in the structure of the skis.
Rob