I love that idea, of Superman basically writing books about his thoughts on the world, his life and his experiences.

There's a story Maggin or somebody wrote where Luthor and Superman teamed up to explore the universe together after Lois Lane died and Lex was reformed (presumably by Cal Anderson, his psychiatrist in another Maggin story, "the Ghost of Superman-Future".) I remember thinking the story had some major problems, but that the idea of the two of them as space explorers and friends was a lot of fun.