Halo had the Cortana Letters. Halo 2 had the alternate reality game I Love Bees. Halo 3 now also has an alternate reality game Iris (that begun with Adjutant Reflex) that started this week.
No doubt over the next months we’ll see a lot of this viral marketing campaign, but we’ll only report about it if it reveals some interesting info about Halo 3 as the following video shows hints about story elements like The Ark and the Halo array.
Click on the bottom-right corner arrow to view it full-screen.