Since I believe that this is a subject that many should be involved in, I guess I will finally get off my butt and chime in on.
18001 is gaining a lot more steam in the real business world, at least from where I sit. A lot of us were interested in the Z10 standard when it first came about, but interest has waned significantly, especially those of us who are in, or moving to, global business. At this point, for those of us who have worked our tails off getting internationally recognized business systems put into place it seems to be a step backwards to register a quality system to a standard that is not recognized outside of our country...or even not recognized in our country.
Now, I am not saying that we don't have an excellent safety program, we do. But, it is our (and I'm sure a lot of others) position that if we are going to go through yet another audit scheme, we would like it to be an international standard.
Just to add the opinions, thoughts and comments of a working woman.

Disclaimer: these opinions may, or may not reflect the decisions and opinions of upper management, dependent upon many factors.