Alive In Joburg is the 6-minute, documentary-style short that District 9 was based on.
Neill Blomkamp was originally tapped to make a feature-length movie based on the video game Halo. That project was scrapped, but this video splices together his three treatments of the subject.
Another short film about robots becoming integrated with human society, Tempbot addresses the concept of alienation in the workplace.
Yellow, about a synthetic human, was created for Adidas as part of a series of shorts in which directors explored their emotional responses to different colors.
A Citroen ad with a dancing robot car. This is way better than Transformers 2.
More alienated robots. Tetra Vaal is a fake corporate video for a robotics company.
Just in case you need some more convincing to go see this movie.