Spirit of the Marathon is now available on DVD and Amazon on demand (which is pretty cool, btw). Anyway, it is inspirational, and reminds nonrunners of the many sacrifices made during training than translate into the ability to run on the big day.
And the speed of Daniel Njenga -- wow. How smooth, graceful and fast. Deena Kastor running 140 miles a week for years on end. I'm no mathematician but that is an average of 20 miles a day seven days a week.
My only complaint (admittedly parochial) is that my frame of reference is New York and NY marathon. And they are barely mentioned. And I was curious about the times of the various finishers, which they did not show.