This is an exemplary chart from the NYT Sports page. It provides a clear, informative and exciting way to visualize how the baseball season has gone for the Mets this and last year. It's been mostly up and not much down.
We can observe the more subtle differences: last season was a steady rise with only two prolonged down periods; this season's curve is driven by two up periods (including right now), outside of which the record has hovered around two levels (0, +3).
Especially commendable is the judicious use of axis labels. However, I'm not clear on how some of the labels were chosen. For example, 14 games ahead seem to me a rather arbitrary one.
All in all, a job well done.
Source: "Not Only Yankee Fans Cheering for Week 22", New York Times, Aug 27, 2007