Over at Joy of Sox are the stats for each of Lilly's regular-season appearances against the Red Sox (he's also pitched against them once in the postseason). We all know he owns the Sox, no matter who's in the lineup, but this jumps out at me:
Prior to October 4, 2003: (26 IP): 0-2, 5.54 ERA, 1.57 WHIP
Since then (inc. postseason): (76.2 IP): 5-1, 2.58 ERA, 1.15 WHIP
I assume this has been pointed out before, but October 4, 2003 was Game 3 of the ALDS, before which some Boston players wore L-I-L-L-Y on their backs to get the fans chanting. It was pretty bush-league; I guess the team's paying for it now.
(Note: Lilly has not become a substantially better pitcher since that day. His lifetime ERA prior to that was 4.68. It's barely budged since then, at 4.66.)