Sorry for the delay, burnhal.... We, here in the intermountain area of the U.S. have only recently been able to survey our winter kills of honeybees. While, I'm not a commercial beekeeper, I have friends and contacts who are that are deeply involved in the investigation.
Those that have dug their hives out of the snow have found, on average, a 35% loss, just over winter. This is up from a normally expected fatality rate of about 24%. It's still to early, this far north to assess if any of the losses were due entirely to CCD (Colony Collapse Disorder), since other maladies were observed and diagnosed as well. We have considerable support from almost all agricultural universities as well as the Federal government.
My own suspicion centers on the fact that our entire population of billions of bees comes from but a few hundred (at most) breeder queen bees. I think the lack of genetic diversity will certainly be found to at least contribute to the problem. It'll be a while yet...