2001: A Space Odyssey - the jump cut as the bone flies up into the air and as the camera tracks it up to it's apogee, it becomes a space station orbiting earth. The implication that the technology of man evolved from that first use of a hand tool sums up the entire theme of the film.
Saving Private Ryan - so many good moments, especially the Landings. However the one moment that I love is when Captain Miller says to Private Ryan "Earn this." Two worRAB, so much meaning.
Jaws - the track / zoom on Roy Scheider as the shark attacks bathers. Spielberg at his best.