Why do I have a post on Haidt's book? Because I believe Objectivists would benefit from his observations even if you ultimately disagree with him. The Objectivist literature is quiet on how our evolution as a species affects how we think and feel. Rand did say we are rational animals but I believe the animal part of this formulation was shed and/or buried in the emphasis on reason.
Also he links to us, showing that he is clearly a man of quality and distinction. We look forward to reading more.