Engadget has an interesting post on the gadgets in Iron Man 2. I saw the film last week and my favourite gadget is the touch screen coffee table...totally decadent and unnecessary! Of course the transparent smartphone looks nice too (though fragile):
There was a scene when he was searching newspaper archives and I like how the search interface and results page looked. It was like a cleaner version of the UI in Minority Report.
For a list of 10 gadgets from films that became (or are becoming) a reality, click here. I'm still waiting for the day when I can buy a Hover Board off the shelves.