Interesting list you got there, care to explain what makes those particular movies relevant?
Cool, thanks. I could write an essay on each of them, but I'll be brief with a few keywords
Babel: Globalization, developed vs. emerging world, immigration, terrorism, aimless youth with no future
Saw: Torture, use of viral media (admittedly on a smaller scale), casual use of violence as a form of "justice," electronic voyeurism
Minority Report: Hi-tech, cyberculture, preventative arrest, public order panics, civil rights vs. security
Kill Bill: Pastiche of older film styles, female empowerment through destructive acts, globalization again
Knocked Up: I hate this movie, but if I were to pick 3 from this list, this would be one of them. Represents the erosion of traditional family units, casual sex and casual reproduction, Gen Y relationship culture, parents trying to "take back" their old lives, multi-family and collectivist households
Battle Royale: Again, a statement of the aimless and destructive youth culture and society's destructive attitudes towards youth (Japan was years ahead of the rest of the world in this), destruction of social compacts amid desperation
The Dark Knight: liberty vs. security, terrorism, disintegration of social compact, dark heroism
The Road: breakdown of social compact, man eating man, poverty, change in economic order
28 Days Later: as above, with it bio-engineering revolution and destruction of traditional old world societies
Precious: race, poverty, disproportionate impact of social problems on women and girls, a very 2000-ish treatment of things like sexual abuse, homosexuality, alternative education and HIV
The Wrestler: Individual struggling against economic, social reality that has no place for him
The Hangover: Male culture taking back and celebrating the things they were supposed to be ashamed of, celebrating excess against a backdrop of unwanted responsibility and traditional family roles
God help me, I forgot to put the (IMO overrated) Slumdog Millionaire in here as well. Themes of globalization, modern capitalism in action and culture of quasi-celebrity.