If you are a fan of this movie, here are a couple of great web pages w photos, sound clips, scripts, original story ("Farewell to the Master" by Harry Bates), etc. --
*http://www.dreamerwww.com/tdtess.htm (highly recommended)
*http://members.yourlink.net/jgerard/gort/index.html
Also the movie was recently released on region1 DVD w commentary by director Robert Wise. (~$15 at Amazon).