.... why not just use a mobile phone clipped to your shirt (since that's all a star trek communicator is).

Speakers to go along with the mics as well, to hear the spoken response.

CastleOS has demos that appear to be successfully demonstrating that the Kinect makes a fairly cost effective voice receiver that can cover an entire room.

Do you have a link to this?

Edit: Nevermind, I read that as CentOS...