One note about Jerry's additional times. The Trailbreaker times seem slow for a reason. Trailbreaker is listed as one of the 25 (or is it 30?) hardest marathons in the country for a reason and the reason isn't that it's a PR course.
That's the tricky part of comparing times in marathons. The course and conditions have to be taken into account. Comparing Trailbreaker to Chicago or even comparing Lakefront in 2002 or 2004 to Lakefront in 2003 opens you up to introducing outside variables.