This is undoubtedly the coolest use of Skype I have seen yet. I often joke that with a satellite connection you could talk from the top of Mt. Kilimanjaro to another guy at the top of Mt. Everest, but looks like these guys are actually doing it.
One of the neat things I have been working on is the ability to audioblog using Skype, so remotely on a PDA, say hanging by your fingertips to the rock on the North Face of some mountain :) you could take a moment and audioblog your experiences if you had a Sat. connection, through an RBGAN.
Unfortunately you could end up audioblogging your screaming death plunge if you fall off during your session. Although you would go out with a bang, your blog would get more traffic than you could imagine.