Lester's BABIP tells me that a lot of the balls that opposing players are hitting off him are being hit hard, though not for HR. I know exactly what Babip means. For BTR, who is becoming very narrow minded and arrogant about this, here is the link for proof that I am not talking about something about which I know nothing:
http://en.wikipedia.org/wiki/Batting_average_on_balls_in_play
I do not think that this is a particularly useful statistic. Its pretty far down the list for me. But hey look-keep using it and keep quoting it if you feel that its valuable. Since there is no one right answer (did you know that while the Red Sox use sabermetrics many teams in MLB do not put nearly the emphasis on it that we do?) I will keep on quoting the statistics that I believe are useful (#1=ERA, then WHIP, K/BB, ERA+ etc) and you can quote your stuff. As I said, I DO know what this stuff is; I just haven't been convinced that it beats ERA as a prime indicator of a pitcher's effectiveness. As I said, baseball is a simple game.