I should clarify the question. So far re: the posts, half understood, while the other half might not have. It wasn't about surround side speakers but specifically the rear speaker(s). This would be DD EX and DTS-ES where you have either 1 or 2 rear speakers. So, what DVDs make the most use of the rear speaker(s)?
Roger - Two that have been mentioned will certainly keep your surround rears busy - they are Gladiator & The Haunting
I would also add The Phantom Menace (Pod Race)
I also agree with the post about the extra ambience using the rears that some films have The Others is a good example IMO - Paul
Se7en: Platinum Edition (DTS-ES Discrete 6.1)-- New Line
But for sheer rock 'em, sock 'em 6.1 surround with loads of clean, low bass it's still The Haunting SE with DTS-ES Discrete 6.1 created from the 24 bit archive master stems at Skywalker Ranch-- yowza! The Phantom Menace is nothing compared to the total system destroying ferocity of this baby. Too bad the movie itself stunk to high heaven!
Hey go whole Hog! Get the Ultimate 3-D collection by IMAX at Amazon.com. OK the movies are not the greatest (you get 3 DVDs). I have viewed one so far - "Haunted Castle" and it makes wicked use of the rears. Basically in several scenes the main character talks in the rear to make you part of the movie. Oh yah the 3-D effects are the best I have seen to date - uses fairly new technology with shutter glasses included in the package!