Well, when I heard that WebRTC was in Chrome stable I thought this must surely include DataChannel, since it's simpler than a full-blown video stack. So although it being behind a flag is better news than it not being there at all, I was still pretty disappointed when I read that page :)
edit: also, I don't see it as an about:flags flag.
edit 2: I should just tunnel data through video then, what could possibly go wrong?