If you've been around the Halo block a few times then you probably know that Microsoft does a great job of viral marketing via the use of Alternate Reality Games (ARGs), like I love bees, for Halo 2.
Well, now that Halo 3 is a mere seven weeks away, its ARG is heating up. If you head over to halo3.com, you'll see a series of "episodes", three of which are unlocked.
If you choose an episode, you'll get to manipulate a hovering pod. I won't tell you how to access the pod as that's half the fun of discovering what each pod has to say.
If you like this sort of thing (and who doesn't love a sci-fi mystery?) then you can catch up on all of the activity thus far by heading over to halo.wikibruce.com/Home.