A recent interview with the director of District 9 and the upcoming Elysium, Neill Blomkamp, features (among other things) him explaining why he's glad that the Halo movie, which he was at one point set to direct, fell apart.

“The luck is the fact that Peter and Fran let me make [‘District 9’] out of the ruins that were ‘Halo,’” Blomkamp said. “What happened out of that was learning to trust my ideas. If ‘Halo’ had come out and succeeded or failed, I wouldn’t have learned that.”

Interesting stuff.