There has been another similar topic in a while and there was at least a dozen titles mentioned. From what I remember
Layer Cake - Better video encoding
RE: Apocalypse - Better video encoding
16 Blocks - From Sony, PCM audio and video similar to Warner US release
MI3: double BD-50 with more extras (maybe better econding)
Black Rain: 2 disc set, more extras (maybe better encoding)
Dreamgirls: 2 BD-50 disc set - probably more extras or video encoding
Happy Feet: PCM audio
Warner's early inferior MPEG2 (not that MPEG2 is inferior, but Warner's MPEG2 version of the movies) are in VC-1.
Face/Off, Cinderella Man, Scary Movie 4, Ghost in The Shell 2, Hostel, The Cave, Emily Rose, Rent, Producers, The Pacifier not released on US.
I guess that's a good one to start