"Book of Eli" had some great "post apoc" moments (many that I'd love to see emulated in FO:NV & FO4), but [perhaps amazingly, to some] the one film that reminds me the most of Fallout was the recent remake of "The hills have eyes".
Its not related to Fallout, and I couldn't find a single PG13 clip that I could link to, but there are many music videos on Youtube that incorporate the combat scenes; I don't think anyone can watch yet not see the intentional similarities of the film to the game Fallout.
But here is a quick picture...
http://i271.photobucket.com/albums/jj125/Gizmojunk/hhe.jpg
Or the FO3 version
http://i271.photobucket.com/albums/jj125/Gizmojunk/hhe-1.jpg
Oh... and there's this bit....
http://i271.photobucket.com/albums/jj125/Gizmojunk/13.jpg