In May 2005, the 1&9 line became just the 1 line. See MTA statement (pdf).

How the 1 Performs (our line profile and rating)

1 Schedule, Map and Station Info (courtesy of the MTA)   

1 Line Diversion Notices in effect now

New York’s Best Interactive Subway Map (courtesy of CMAP)   

1 Line Rider’s Diary

Call or Fax the 1 Line Superintendant

How to Complain and Get Results

How to Lower Your Fare