This should probably go under Sprockets but I figured it would get more general interest here.
My wife and daughter went up with a church group to volunteer at the Iditarod and associated events (basketball tourney, etc.) and to generally help out the locals and such. When they came back they had pics of people biking the Iditarod Trail.
It's this - http://www.alaskaultrasport.com/alaska_ultra_home_page.html
I guess riding a dog sled 1,100 miles wasn't hard enough!

