I feel so enlightened. Prior to this reading I would have said "timber frame" and "post&beam" were just different terms for the same thing. I also learned a new word, "anisotropic" was it? I know an engineer who took down a 150 year old timber frame and re-erected it as a post&beam. One thing I did notice is that the steel joinery "sweats" in the summer and doesn't seem to be doing the timbers any favors.