This is a useful wikipedia article on the cultural impact of star wars
http://en.wikipedia.org/wiki/Cultural_impact_of_Star_Wars
Also have a look at this:
http://www.bukisa.com/articles/301539_star-wars-influence-on-popular-culture
And the History Channel documentary 'Star Wars The Legacy Revealed' might be useful - it looks at the history that inspired star wars, connections to ancient mythology and how star wars is relevant today
http://www.youtube.com/watch?v=rHa5RbuH5F0
Also these might be useful:
http://www.galacticbinder.com/pgeorge-lucas-on-the-impact-of-star-wars.html
http://answers.yahoo.com/question/index?qid=20091110123554AAxbHwP
http://findarticles.com/p/articles/mi_m1272/is_n2634_v126/ai_20409138/
http://www.space.com/8917-star-wars-changed-world.html
http://www.time.com/time/arts/article/0,8599,1173216,00.html
http://www.hollywoodinsiders.net/articles/george_lucas_illuminati.html
hope this helps in some way