You may want to ask in the Customization group.
http://forums.autodesk.com/t5/Autodesk-Inventor-Customization/bd-p/120
Mike
Are you on subscription, by chance? If so, you have access to iLogic. I think that iLogic is going to be the way to go.
If you don't you will have to write a VBA macro that will pull the sheet name into an iProperty that the title block can see.
No, no subscription. We take a very "thrifty" approach to CAD software!
I think I will start learning VBA, though. It's rare for a month to go by when I don't want to do something that I can't do without it.