There ARE survivors from the World Trade Center - many of them got out after the first strike. No data on survivors or lists at this time, right now the only thing planned is to get everyone south of Canal street out of the area. Outside of Manhattan, subways ARE operating. Within Manhattan, there are significant delays. The A train is working at this time, but the safest and best thing to do right now is walk out of the area.
Nothing remains standing from both towers.
A portion of the Pentagon building has also collapsed, and a fourth airliner has crashed in Pennsylvania. There may or may not be another airliner missing, there is still some confusion over flights missing. A second airliner was reported inbound to Washington DC and F-16s were scrambled to intercept, however there is no word on whether or not anything was found. LAX has been evacuated, as well as Disney World in Orlando. No word if this was for any specific threat or as general emergency response.