Yourdiseaserisk.com is still a little slow - a recent WSJ article overwhelmed it with traffic - but I had great fun altering my lifestyle choices to see how they affected my risk for various catastrophic illnesses, such as stroke, heart disease, diabetes, etc. (It's like working for a life insurance company.) The site comes with good credentials, too: it was designed by the Harvard Center for Cancer Prevention. What have I learned so far? Nothing too surprising: not smoking and getting a basic amount of exercise drastically reduce your chances of getting just about every disease.