I have still dozens of Falk paper maps in my cabinet. With the small Garmin 60 CSX, however, that includes most US and European cities, I don’t need them anymore.
But what about more remote locations where conferences are now so often located? Prophotocoalition.comhas a nice review of the “digital trekker” mainly discussing offline iphone applications like d “City Maps 2 toGo”, “Galileo” and “Openmaps“.