I'm a pretty big Bladerunner nut and getting that movie on Bluray with all the mattes restored etc was my sole reason for finally going bluray. As soon as it was confirmed that they were going to release it I bought my PS3.
For a philip k dick fan, ridley scott, harrison ford or just good scifi fan it's a nearly spiritual experience to see it that beautifully done.
Pretty much any pixar film looks great. UP and Wall-E as well as Ratatouille were all equally gorgeous in 1080p.
Close Encounters, Leon: The Professional (it is the uncut version by the way), and District 9 I have to agree on all counts.
Also, Labyrinth, Hellboy 1&2, The Dark Knight, Fifth Element, Sunshine, The Matrix (will only tolerate the original), Big Trouble in Little China, Star Trek 2009, Star Wars 4-6 and Iron Man are all definitely worth getting on Bluray.
There are many more of course, these are just the one that come to mind immediately.
For the record the Star Wars originals are not exactly bluray *ahem* but they can be found. It's a rip of a broadcast the sky TV had in the UK of all 6 movies. Some genius bastard used his HDMI editing card from his AVID to capture all the footage in full res and made files of them. Unfortunately they ARE the "updated" ones that Lucas did, but at this point I don't think you'll ever get the originals in unedited form in hi def. Lucas hates them and refuses to give the fans what they want.
I can't wait for Alien, Aliens, The Abyss, etc. I want all the classics!!!! T2 was a let down. They didn't remaster it at all and basically scaled it up to resolution. I actually can't believe it since it's such a staple film.
Quick giving me crap like "Are We There Yet" and release the real deals man!