Q posted an old pic from Iditabike in 1990. Coincidentally I had recently picked up the latest issue of Mountain Bike Action which had a pic from 1993 of a custom Clark Kent bike built for Iditabike. It had a wheelset consisting of two wheels laced onto each custom hub so the rider could run two tires per wheel. This would give a much wider tread to help give some "float" when riding in in snow. 20 years later and the options for fatbikes have become almost too numerous to count. I need to get one.
Here is the Clark Kent