New millennium, new technology. Film cameras were the standard way to shoot a movie for over a century, and now they to had to make space for upstart digital. Without digital cameras, zombies would've stayed dead; 28 Days Later was only possible with how quick and easy it is to set up with them. Sofia Coppola (Lost in Translation) and Neill Blomkamp (District 9) certainly benefited from the new technology.
Movies were also used to absorb our collective trauma. We escaped into magic and wonder in the months after 9/11 with Harry Potter and The Lord of the Rings, while we celebrated the end of the Great Recession by getting the hell off this planet with Avatar. And speaking of those series, we didn't want their installments taking up all the spots on this list, so one movie representing the whole franchise was chosen for those worthy.