NYC Subway LED Signage / 20090923.SD850IS.3142.P1 / SML
These appeared new to me but I am not sure if it's just that I have not been on the newer trains. These newer signage, seen on the M train today is very user-friendly. Easy to quickly tell what the next stop is and easily reusable for all different lines.
See SML Pro Blog: New York City Subway LED Signage for complete description, photos and videos.