I would guess there isn't much overlap between Arduino users and Twilight fans, but maybe some of you have seen or will see this project during the newest Twilight movie released today.
We worked with Tangible Interaction to create a fully programmable ambient lighting system for the graduation party scene. Over 100 globes are suspended from the ceiling and light up in any desired color. Each globe contains a macetech Satellite Module, and is controlled with a macetech ShiftBar. The ShiftBar chains are controlled with an Arduino DMX solution developed by intellijel (also seen on these forums from time to time). Tangible Interaction was contracted by the movie producers to head the project and did the system integration, built and installed the globes and control electronics, and developed the visual effects.
I wrote up an article describing the hardware in more detail, and how we solved a major problem that almost killed the project: Twilight Eclipse Globes: macetech on the silver screen