Lots of movies, but THE major piece of inspiration was definitely the Mad Max trilogy.
- The leather armor of Fallout 1 and 2 is the one Max wears in Mad Max 2 : The Road Warrior
- Dog Meat is clearly inspired by Max's companion in Mad Max 2 : The Road Warrior
- The Chrysalis Highwayman car from Fallout 2 was inspired by Max's "Interceptor"
- The clothing and punk hairstyle of the raiders was copied from the Highway gangs in Mad Max
- The Intro's of all Fallout games were inspired by the really cool intro to The Road Warrior http://www.youtube.com/watch?v=frENmS2EJKg&feature=related
- Junktown from Fallout 1 (aswell as other towns in the series) was propably inspired by Bartertown from Mad Max 3 : Beyond Thunderdome
- The Tribals of Fallout 2 and Little Lamplight from Fallout 3 were both inspired by the children tribe from Mad Max 3
Not to mention that propably the entire atmosphere of Fallout was inspired by those of Mad Max
There are lots of other sci-fi and post apocalyptic movie references in Fallout but Mad Max was clearly the main guideline throughout the series. And thats cool as the movies are great. :flamethrower: