Max Roberts has redesigned the NYC Subway map. His circular layout is very interesting and possibly more aesthetically pleasing than the existing map. I’m afraid I’m too biased to judge the ease of use of this map. However, Roberts will probably perform some usability studies on these maps to see how well they work for those less familiar with the city’s geography and the subway system.
He’s done a similar map for London’s underground. If you like either one, prints are available on demand.