Altered States, Brazil, and The Adventures of Baron Munchausen are all movies I own on DVD that I've been meaning to get on Blu-ray for a while. Love Altered States and Baron Munchausen, but haven't seen Brazil in years and need to rewatch it.
As for In the Mouth of Madness, I did have an old Warner Brothers blu-ray, but when I tried to play it a few months ago, it wouldn't read! I inspected it only to find the data layer was bubbling up around the edges of the disc, rendering it a coaster. I have never seen this happen to a Blu-ray before. But it was a good excuse for me to pick up the more recent Scream Factory release that has way more special features!