The Lord of the Rings: The Fellowship of the Ring, Extended Edition - The Appendices, Part One: Two and a half hours on this disc alone! I'm only about an hour in, truth be told, and I'm loving it. Everything about these films is so polished, right down to their packaging and organization. The Play all feature on these appendices is brilliant.
I didn't realize that both Tolkien's parents were dead by the time he was 12. And then to lose all his mates in The Great War... It certainly puts his stories in a different light.
I'll probably have more to say on this as I work my way through the discs.