Buy a few dvds. Just go to the Disney store. Or if he has a particular favorite character go look around for a cool figurine. I am 22 and I still love Disney (although I am also extremly partial to musicals and horror movies). My husband is not to fond of them and he thinks I am cute for liking them, although I got him to watch 'Mulan 2' with me last night :)
'Ratouille' was pretty good if he had seen. 'The Bridge to Terabithia' was pretty good, although not a traditional Disney movie. I generally stick with the older ones. My dad (especially) and my husband both liked 'Cars'.
You could always go to the theater to see a new Disney movie. I am in Iraq right now, so am a little unaware of what's out. Maybe have a nice dinner date before hand.
I'm sure he will appreciate whatever you get him.