I don't think 65mm films should count, since they are already essentially IMAX sized. That excludes 2001 and LOA.

My vote? Aside from the usual suspects (SW, ROTLA), maybe Apocalypse Now, Superman, Alien, Blade Runner and The Matrix. I guess the format suits "big" popcorn type of movies, or visual ones. Would be an interesting experiment to release something like an Altman film, or something like In the Mood For Love or Hiroshima Mon Amore, something very character based and subtle. Crouching Tiger kind of straddles the line between "big" visual films and subtle character films, could be a best of both worlds kind of thing. The reason I seriously advocate character/art films is because when I saw Blade Runner: Final Cut in a 4K theater presentation in 2007 it was one of the most emotional theater experiences I had, not because of the visuals but the performances; I always thought it was a cold film, but seeing the actors that big, the scene where Deckard tells Rachel she is not human took on a whole new dimension. The acting in that scene: its 100% in the eyes, since the performances are a little (deliberately) stilted, but you only understand that when it's on a HUGE scale, it was incredible. Oh yeah, spoilers. What, you haven't seen Blade Runner?

Or for a joke, 28 Day Later or Tadpole, films shot on late 1990s standard-def consumer-level video cameras (well, they called them "pro-sumer", which is just a marketing term, but they were sold in higher-end electronics/photography stores).

I saw Jurassic Park in IMAX in 1993--I guess it was the first Hollywood feature shown this way, at least in Canada, and it was very, very limited, maybe even this one screening--and everyone should see it this way. Jaws would convert well too.