Just as an addendum to my Asperger's post a couple of days ago...
I recently saw a link to an Empathy Quotient test at Massimo Pigliucci's Rationally Speaking blog. Go take the test, it's only 60 questions.
Holy shit, I can't believe how low I scored. My wife scored 45, which is close to average for women (47). Most men score around 42. Most people with Asperger's Syndrome score around 20. I took 'the test twice, the first time by myself and the second time a few days later with my wife of 18+ years looking over my shoulder and "correcting" my answers.
My two scores were 16 and 13 respectively. That's really depressing and now my wife mocks me about my supposed "lack of empathy." No wonder I decided to study rocks in college.