I just watched a documentary on Universal Sports called Human Express. It's about ultrarunning legend Karl Meltzer's running of the Pony Express trail last fall. It's an hour long and pretty interesting. I wish no ill will toward Karno, but it's nice to see another ultrarunner getting some face time on TV. It airs again today. Check your local listings.
Speaking of other ultrarunning legends, Indulgence is also airing a couple of times (about Anton Krupicka). It looks like there are a few other good programs that are part of their Adventure April series, too.