This is something that I've just started messing around with. It uses Panic Software's Status Board app for the iPad.
The pic is merely a proof of concept at this point (the data are pretty much gibberish.) I have VERY rough python scripts that hammer out CSV and JSON files to a local folder which in turn feed the charts (I may change the scripts to read an sqlite database rather than Indigo real-time which will make it easier to do time-series data.) The Indigo log data is actual and is fed through RSS. Status board allows for refresh rates as low as 15 seconds.
One of the cool things about the Status Board app is that (for an in-app purchase) it will also output the screen through an HDMI adapter--if you want to go really BIG SCREEN.
http://www.panic.com/statusboard/