The infamous crab-walk. Sorry for no audio, it wasn't available on the special edition box.
Update: this scene with sound here: http://www.youtube.com/watch?v=Bs3mNIu70-E
This reveal of the Alien as Lambert secures supplies for the escape shuttle was omitted because it violated Ridley Scott's desire to hide the Alien's human configuration.
Alien 5 being a prequel confirmed-: http://www.totalfilm.com/news/alien-5... It's actually a prequel movie that will explain the origins of the space jockey spaceship.
Plot: The story begins when the crew of the commercial transport ship Nostromo receive a transmission which might be of nonhuman origin.
They land on the deserted moon Acheron LV-426 and find a derelict spaceship with a dead alien and many large eggs.
Directed by Ridley Scott © 20th Century Fox
I recommend the High Quality version
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This article covers all the known deleted scenes from the 1979 film Alien. Some of these...