Found something:
Can We Make A Render Farm From Using Xbox's?This is more like a theoretical exploration of using some kind of linux cluster for rendering.
I was more thinking in the lines of a stand alone program one could simply start from the Dash. The program would than wait for a 'jobfile' to apear in a working location. The jobfile would then specify the scene file and which frames to be rendered by the machine.
In this way, i think, there would be the least overhead, and no need for complex networking structures.