This is taken from that link:
From here on out, all you need is a DVD with a THX logo on the cover that's been made in the last several years. And there are plenty of them that should be sitting on your shelf right now. Here's a list of just a few of the most high profile THX titles:
All six Star Wars movies and the Indiana Jones trilogy, Pirates of the Caribbean: The Curse of the Black Pearl, the Toy Story movies, Finding Nemo, and Cars.