Ah, that sucks. I've used GoogleTV for this (with a web page, but no real attention to style; usually just a few numbers and lines, graphed), and while google eventually opened up googletv to developers (late enough that the platform seems to have died first), I guess Apple still hasn't. It is still a great box for a conference room projector (with AirPlay).
What is the best way to get nice, easy to configure status boards for cheap 42-65" LCD tvs then? Is there a web alternative which makes boards like this easy to configure? Dedicating an iPad for every TV is more expensive and just a huge management hassle.