Hi James,
Unfortunately without having a third party dashboard application such as Xtraction (CA is Reseller Partner for Xtraction), OR using Jasper Reports which comes packages with service desk but does require a separate install on a separate server etc., or using the "poor mans dashboard" as mentioned by Cristi, there really isnt another way to pull data in real time to a universal feed that i know of. The only thing that you might be able to try is some type of web services call using REST or SOAP and display the results in some way that you can put up on that board.
I really dont think you can accomplish any of these items without some admin or database access or another application integrated with Service Desk to do this for you. It seems that from your last post you want to be able to do this without having admin or db access to the application - that is extremely limiting and most likely wont be able to be accomplished.
Thanks,
Jon I.