"I'd be very interested to learn how they are going to crunch the ratings data, at least in broad outlines. I assume that a simple average of ratings won't do, that they'll have to weight ratings given by the rating of the doctor making the rating (pagerank-style), and perhaps come up with other ways of determining the authority of the doctor making the rating. Incidentally, is HealthTap making public the individual ratings/reviews being given (anonymized, perhaps), or just the resulting aggregate scores?" - Michael R. Bernstein