I enjoyed this post - and I am an anarchist/voluntaryist. I'm almost ready to go to bed, but I'll comment something to comment more tomorrow.
I'd like to think that my personal morals equal those of the morals of voluntaryism, but I don't think I can make a claim that my morals are an objective fact.
There is no ought from is - at least no one has been succesful at convincing me otherwise.
One of the best arguments, however, I think, for the voluntaryist morality is the fact that if we only concentrate on consequences, we may justify some terrible means that lead to the desired ends. History has examples of this.
RE: Arguments against objective morality