Jason, if they taught me this one in college, then I've forgotten why. I just did a little Google research, and came up blank. I'll put a feeler out on a cooking website that I'm a member of, and see what kind of responses I get.
FWIW, I end up doing about 50/50, usually adding salt before it boils, but many times forgetting, and adding the salt after it boils. I never notice a difference between the two.
Perception Search 13