[michael_dorfman]

I found the link here:http://www.cartesia.org/geodoc/icc2005/pdf/oral/TEMA3/Sessio..., and the map-folding concept described there is pretty sweet.

[onemoreact]

That looks cool but actually sucks for map's because it does not handle edge transitions well. The according method which most maps use is designed so you can open a reasonably arbitrary section of map at the same time which is important when you want to do things like compare routes which cover 4 folds at the same time. All the while being able to quickly flip it over and see what's on the other side.