I think I read somewhere that Ridley Scott was inspired by 2001 and the "dirtiness" of the ships in Star Wars. He thought that the ships looked "used" and thought that was great.
When I watched Alien for the first time (about 7 months ago! yikes) I noticed that it had really inspired shots. Shots that were trying to evoke Kubrick. I'll have to get myself a DVD copy. I think the first 2 Alien movies are outstanding. I've only seen each of them once. But the more I think about them the more I know they're classics.