thoughts after making a few of myself:
you need something that ties the whole thing together
if crag climbing, good scenery (if nice scenery, an cut to crux climbing (if belaying, your leader will love this )
Alpine can be cool because lots of great scenery, others may not have been there and would like to see what it is like.
Good editing and good soundtrack really make a difference
What are you shooting with? For Youtube/Googlevideo, my Canon SD600 works great, but if you're doing it for other usage...well, of course DV and even HD cameras are getting cheaper.