It would be cool to be able to peform some kind of action as one rolls over records, fields, buttons ... basically anything that has a tool tip. Be also able to attach an action to that roll over/hover.
The example I am thinking of would be something where one could roll over summary records and highlight a particular line on a chart. But so many other things that one could do.
I know this would not work on the iPad. But I have seen the iPad have a touch and hold event so maybe it could be supported that way.