Last night around 7EST, the website http://126.96.36.199, which has been tied to the Halo 3 ARG, made one subtle change...
It started chirping... OR clicking - it hasn't been decided yet.
A group called "CompoundIntelligence" over on the Bungie forums first discovered the change and had started discussing it, when roughly 3 hours later 'Adjutant Reflex' made his/her/it's first post in about a week. It reads as follows:
Can you feel it?
Beating at the heart of the Universe?
Skin too thick to be sure.
It's alive though.
What do I do with life?
So perhaps this 'chirping' isn't really chirping at all, but rather signs of life; a heartbeat - Not only the heartbeat of Adjutant Reflex, but of a ARG once thought to be dead.
Head over to Bungie.net and discuss.