What I like so much about "28 Days Later" is how it's different from the typical zombie film. On the more literal level, the zombies in this film run at a normal speed as opposed to being slow and clumsy. But what I really really like about the film is it's exploration about humanity and about what people would do under desparate circumstances. I don't want to spoil it too much but it's a pretty deep film, definitely more than a zombie film.